The Difference Between RAM Speed and CAS Latency

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large-7 cards-column"> <div class="row small-up-2 medium-up-3 align-right custom-border-right"> <div class="megamenu-card"> <div class="card card-container"> <a href="/catalog/memory/ddr5"> <img data-srcimage="https://dmassets.micron.com/is/image/Microntechnologycrucialprod/crucial-DDR5-group 3?$responsive.jpg$" title="DDR5 RAM" alt="Crucial DDR5 SODIMM and UDIMM line-up"/> <div class="card-section"> <p title="DDR5 RAM">DDR5 RAM</p> </div></a> </div> </div> <div class="megamenu-card"> <div class="card card-container"> <a href="/catalog/memory/ddr4"> <img data-srcimage="https://dmassets.micron.com/is/image/Microntechnologycrucialprod/crucial-lineup-memory 2?$responsive.jpg$" title="DDR4 RAM" alt="Crucial DDR4 SODIMM and UDIMM"/> <div class="card-section"> <p title="DDR4 RAM">DDR4 RAM</p> </div></a> </div> </div> <div class="megamenu-card"> <div class="card card-container"> <a href="/catalog/memory/crucial-pro-memory"> <img data-srcimage="https://dmassets.micron.com/is/image/Microntechnologycrucialprod/crucial-DDR5-DDR4-Pro-group?$responsive.jpg$" title="Crucial Pro DRAM" alt="Crucial Pro RAM"/> <div class="card-section"> <p title="Crucial Pro RAM">Crucial Pro RAM</p> </div></a> </div> </div> </div> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-right align-right " data-magellan data-bar-offset="50"> <a class="anchorlink megamenu-link show-for-large text-right align-right primary " href="/catalog/memory" data-custom-class="anchorlink megamenu-link show-for-large"> <span>Shop all memory</span> <span class="icon text-left simple-link--icon-right">  <svg class="icon-svg icon-chevron-right "> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg>  </span> </a> </div> </div> </div> <div class=" columns large-3 content-column medium-layout"> <article class="card card-container card-default "> <div class="card-content "> <div class="card-thumb " data-srcimage="/content/dam/crucial/dram-products/ddr5-pro/overclocking/photography/in-use/crucial-ddr5-pro-overclocking-inuse-16.psd.transform/small-jpg/img.jpg"> <a class="card-url" href="/memory/ddr5/CP2K16G64C38U5B"> <div class="card-image" data-interchange="[, small]" style="background-position:center center;" role="img" aria-label=" "></div> </a> </div> <div class="card-info-wrapper "> <div class="card-info"> <a class="card-url" href="/memory/ddr5/CP2K16G64C38U5B"> <h3 class="card-title line-clamp line-clamp-2">Faster gaming unlocked!</h3> </a> <hr/> <p class="card-text line-clamp line-clamp-4 ">Push performance to the next level with Crucial DDR5 Pro OC Gaming Memory. </p> </div> <a class="card-button stand-alone-link" href="/memory/ddr5/CP2K16G64C38U5B"> Crucial Pro OC <svg class="icon-svg icon-arrow-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-arrow-right"></use> </svg> <svg class="icon-svg icon-arrow-right-active"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-arrow-right-active"></use> </svg> </a> </div> </div> </article> </div> <div class="header-container expanded"> </div> </div> </li> <li class="hide-for-large mobile-submenu"> <span class="row align-middle megamenu-heading"> </span> <div class="row align-middle"> <div class="columns small-12 category-column"> <ul class="vertical menu expanded"> <li class="sub-heading"> <a href="/products/memory">Crucial Memory<svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg></a> </li> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> <div> <li class="category-card"> <a href="/catalog/memory/ddr5">DDR5 RAM <svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"> </use> </svg> </a> </li> <li class="category-card"> <a href="/catalog/memory/ddr4">DDR4 RAM <svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"> </use> </svg> </a> </li> <li class="category-card"> <a href="/catalog/memory/crucial-pro-memory">Crucial Pro DRAM <svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"> </use> </svg> </a> </li> </div> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-right align-right " data-magellan data-bar-offset="50"> <a class="anchorlink megamenu-link show-for-large text-right align-right primary " href="/catalog/memory" data-custom-class="anchorlink megamenu-link show-for-large"> <span>Shop all memory</span> <span class="icon text-left simple-link--icon-right">  <svg class="icon-svg icon-chevron-right "> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg>  </span> </a> </div> </div> </div> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> <div class="category-shop"><a class="category-links">Shop by type<svg class="mobile-navigation-arrow icon-svg icon-chevron-down"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-down"></use> </svg></a> <div class="category-links-content"> <ul> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/memory/desktop-dram" analyticscategory="Top navProd"> <span>Desktop memory</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/memory/laptop-dram" analyticscategory="Top 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</div> </li> </ul> </div> <div class=" columns large-7 cards-column"> <div class="row small-up-2 medium-up-3 align-right custom-border-right"> <div class="megamenu-card"> <div class="card card-container"> <a href="/catalog/ssd/nvme"> <img data-srcimage="https://dmassets.micron.com/is/image/Microntechnologycrucialprod/nvmes-1?$responsive.jpg$" title="NVMe SSDs" alt="Crucial NVMe SSDs product line-up"/> <div class="card-section"> <p title="NVMe SSDs">NVMe SSDs</p> </div></a> </div> </div> <div class="megamenu-card"> <div class="card card-container"> <a href="/catalog/ssd/sata"> <img data-srcimage="https://dmassets.micron.com/is/image/Microntechnologycrucialprod/crucial-lineup-SATA-ssds 2?$responsive.jpg$" title="SATA SSDs" alt="Crucial SATA SSD line-up"/> <div class="card-section"> <p title="SATA SSDs">SATA SSDs</p> </div></a> </div> </div> <div class="megamenu-card"> <div class="card card-container"> <a href="/catalog/ssd/external"> <img data-srcimage="https://dmassets.micron.com/is/image/Microntechnologycrucialprod/crucial-lineup-external-ssds-1?$responsive.jpg$" title="External SSDs" alt="Crucial portable SSD line-up"/> <div class="card-section"> <p title="External SSDs">External SSDs</p> </div></a> </div> </div> </div> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-right align-right " data-magellan data-bar-offset="50"> <a class="anchorlink megamenu-link show-for-large text-right align-right primary " href="/catalog/ssd" data-custom-class="anchorlink megamenu-link show-for-large" analyticscategory="Top nav"> <span>Shop all SSDs</span> <span class="icon text-left simple-link--icon-right">  <svg class="icon-svg icon-chevron-right "> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg>  </span> </a> </div> </div> </div> <div class=" columns large-3 content-column medium-layout"> <article class="card card-container card-default mega-menu-tile-banner-p5 "> <div class="card-content "> <div class="card-thumb " data-srcimage="/content/dam/crucial/ssd-products/t500/images/web/crucial-t500-ssd-hs-mobile-image-hero.psd.transform/small-jpg/img.jpg"> <a class="card-url" href="/ssd/t500/ct1000t500ssd5"> <div class="card-image" data-interchange="[, small]" style="background-position:center center;" title="T500 SSD" role="img" aria-label="T500 SSD"></div> </a> </div> <div class="card-info-wrapper "> <div class="card-info"> <a class="card-url" href="/ssd/t500/ct1000t500ssd5"> </a> <hr/> <p class="card-text line-clamp line-clamp-4 ">Elevate your PS5 play with the Crucial T500 Gen4 SSD</p> </div> <a class="card-button stand-alone-link" href="/ssd/t500/ct1000t500ssd5"> Shop now! <svg class="icon-svg icon-arrow-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-arrow-right"></use> </svg> <svg class="icon-svg icon-arrow-right-active"> <use 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</li> <li class="category-card"> <a href="/catalog/ssd/sata">SATA SSDs <svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"> </use> </svg> </a> </li> <li class="category-card"> <a href="/catalog/ssd/external">External SSDs <svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"> </use> </svg> </a> </li> </div> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-right align-right " data-magellan data-bar-offset="50"> <a class="anchorlink megamenu-link show-for-large text-right align-right primary " href="/catalog/ssd" data-custom-class="anchorlink megamenu-link show-for-large" analyticscategory="Top nav"> <span>Shop all SSDs</span> <span class="icon text-left simple-link--icon-right">  <svg class="icon-svg icon-chevron-right "> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg>  </span> </a> </div> </div> </div> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> <div class="category-shop"><a class="category-links">Featured<svg class="mobile-navigation-arrow icon-svg icon-chevron-down"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-down"></use> </svg></a> <div class="category-links-content"> <ul> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/ssd/t500/ct1000t500ssd5"> <span>T500 NVMe SSD</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/ssd/mx500/ct1000mx500ssd1" analyticscategory="Top nav"> <span>MX500 SATA SSD</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" 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data-bar-offset="50"> <a class=" text-left primary " href="/campaigns/versus"> <span>You VS. Time</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/creative-starter-pack" analyticscategory="Top nav"> <span>Creative</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/gaming-products" analyticscategory="Top nav"> <span>Gaming</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/customer/business"> <span>Small business</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/students" analyticscategory="Top nav"> <span>Academic</span> </a> </div> </li> </ul> </div> <div class=" columns large-3 category-column custom-border-right"> <div class="h4 list-headline">Insights</div> <ul class="no-bullet "> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-memory" analyticscategory="Top nav"> <span>Memory</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-ssd" analyticscategory="Top nav"> <span>Storage</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-memory/support-what-does-computer-memory-do" analyticscategory="Top nav"> <span>Technology</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-ssd/how-ssds-help-with-productivity-for-businesses" analyticscategory="Top nav"> <span>Business</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/nvme-ssds"> <span>NVMe SSD guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/sata-ssds"> <span>SATA SSD guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/portable-ssds"> <span>External SSD guide</span> </a> </div> </li> </ul> </div> <div id="custom-align-fixes" class=" columns large-6 cards-column"> <div class="category-title">Trending content </div> <div class="row small-up-2 medium-up-3 align-right custom-border-right"> <div class="megamenu-card"> <div class="card card-container"> <a href="/articles/pc-builders/how-to-build-a-computer"> <img data-srcimage="/content/dam/crucial/dram-products/desktop/ddr5/images/install/crucial-ddr5-desktop-motherboard-hand-non-blue-image.psd.transform/small-jpg/img.jpg" title="How to build your own PC" alt="How to build your own PC image"/> <div class="card-section"> <p title="How to build your own PC">How to build your own PC</p> </div></a> </div> </div> <div class="megamenu-card"> <div class="card card-container"> <a href="/articles/external-ssd/what-is-a-portable-ssd"> <img data-srcimage="/content/dam/crucial/ssd-products/x10-pro/photography/lifestyle/crucial-x10-inuse-backpack-vehicle-1.psd.transform/small-jpg/img.jpg" title="What is a portable SSD?" alt="What is a portable SSD image"/> <div class="card-section"> <p title="What is a portable SSD?">What is a portable SSD?</p> </div></a> </div> </div> <div class="megamenu-card"> <div class="card card-container"> <a href="/about-us/ambassadors"> <img data-srcimage="/content/dam/crucial/campaigns/vs-campaign/images/web/sarina-megamenu2.jpg.transform/small-jpg/img.jpg" title="Crucial ambassador program - Sarina" alt="Crucial ambassador program - Sarina"/> <div class="card-section"> <p title="Meet our ambassadors">Meet our ambassadors</p> </div></a> </div> </div> </div> <div class="container basecomponent parbase"> <div class="container-content top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-right align-right " data-magellan data-bar-offset="50"> <a class="anchorlink megamenu-link show-for-large text-right align-right primary " href="/articles" data-custom-class="anchorlink megamenu-link show-for-large" analyticscategory="Top nav"> <span>View all articles</span> <span class="icon text-left simple-link--icon-right">  <svg class="icon-svg icon-chevron-right padding-0"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg>  </span> </a> </div> </div> </div> </div> </div> </div> </div> <div class="header-container expanded"> </div> </div> </li> <li class="hide-for-large mobile-submenu"> <span class="row align-middle megamenu-heading"> </span> <div class="row align-middle"> <div class="columns small-12 category-column"> <ul class="vertical menu expanded"> <li class="sub-heading"> <a href="/articles">Solutions<svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg></a> </li> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> <div class="container basecomponent parbase"> <div class="container-content top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-right align-right " data-magellan data-bar-offset="50"> <a class="anchorlink megamenu-link show-for-large text-right align-right primary " href="/articles" data-custom-class="anchorlink megamenu-link show-for-large" analyticscategory="Top nav"> <span>View all articles</span> <span class="icon text-left simple-link--icon-right">  <svg class="icon-svg icon-chevron-right padding-0"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg>  </span> </a> </div> </div> </div> </div> </div> </div> </div> <div class="link-list column column-block"> <div class="category-shop"><a class="category-links">Use cases<svg class="mobile-navigation-arrow icon-svg icon-chevron-down"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-down"></use> </svg></a> <div class="category-links-content"> <ul> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/campaigns/versus"> <span>You VS. Time</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/creative-starter-pack" analyticscategory="Top nav"> <span>Creative</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/gaming-products" analyticscategory="Top nav"> <span>Gaming</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/customer/business"> <span>Small business</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/students" analyticscategory="Top nav"> <span>Academic</span> </a> </div> </li> </ul> </div> </div> </div> <div class="link-list column column-block"> <div class="category-shop"><a class="category-links">Insights<svg class="mobile-navigation-arrow icon-svg icon-chevron-down"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-down"></use> </svg></a> <div class="category-links-content"> <ul> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-memory" analyticscategory="Top nav"> <span>Memory</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-ssd" analyticscategory="Top nav"> <span>Storage</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-memory/support-what-does-computer-memory-do" analyticscategory="Top nav"> <span>Technology</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-ssd/how-ssds-help-with-productivity-for-businesses" analyticscategory="Top nav"> <span>Business</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/nvme-ssds"> <span>NVMe SSD guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/sata-ssds"> <span>SATA SSD guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/portable-ssds"> <span>External SSD guide</span> </a> </div> </li> </ul> </div> </div> </div> <div class="link-list column column-block"> <div> <div class="category-card"> <a href="/articles">Trending content <svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"> </use> </svg> </a> </div> <div class="container basecomponent parbase"> <div class="container-content top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-right align-right " data-magellan data-bar-offset="50"> <a class="anchorlink megamenu-link show-for-large text-right align-right primary " href="/articles" data-custom-class="anchorlink megamenu-link show-for-large" analyticscategory="Top nav"> <span>View all articles</span> <span class="icon text-left simple-link--icon-right">  <svg class="icon-svg icon-chevron-right padding-0"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg>  </span> </a> </div> </div> </div> </div> </div> </div> </div> </div> </ul> </div> </div> </li> 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class="h4 list-headline">Customer services</div> <ul class="no-bullet "> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/contact"> <span>Contact</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/returns" analyticscategory="Top nav"> <span>Returns</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/account/account-dashboard#product-registration" analyticscategory="Top nav"> <span>Product registration</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/articles-faq-customer-service"> <span>Articles and FAQs</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/returns/warranty-home" analyticscategory="Top nav"> <span>Warranty Status</span> </a> </div> </li> </ul> </div> <div class=" columns large-2 category-column"> <div class="h4 list-headline">Tools & resources</div> <ul class="no-bullet "> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/ssd-support" analyticscategory="Top nav"> <span>Firmware updates</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="https://www.acronis.com/en-sg/promotion/CrucialHD-download/" analyticscategory="Top nav"> <span>Acronis data transfer</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/storage-executive" analyticscategory="Top nav"> <span>Storage Executive</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/store/advisor"> <span>Upgrade Advisor</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class="system-scanner-menuitem-link text-left primary " href="/store/systemscanner" data-custom-class="system-scanner-menuitem-link"> <span>System scanner</span> </a> </div> </li> </ul> </div> <div class=" columns large-3 category-column"> <div class="h4 list-headline">Self help</div> <ul class="no-bullet "> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/memory/memory-buying-guide" analyticscategory="Top nav"> <span>Memory buying guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/ssd-buying-guide" analyticscategory="Top nav"> <span>Storage buying guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-memory/how-to-upgrade-desktop-memory" analyticscategory="Top nav"> <span>RAM installation guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/ssd/ssd-install" analyticscategory="Top nav"> <span>SSD installation guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/articles-faq-ssd" analyticscategory="Top nav"> <span>SSD FAQs</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/articles-faq-memory"> <span>Memory FAQs</span> </a> </div> </li> </ul> </div> <div class=" columns large-5 category-column"> </div> <div class="header-container expanded"> </div> </div> </li> <li class="hide-for-large mobile-submenu"> <span class="row align-middle megamenu-heading"> </span> <div class="row align-middle"> <div class="columns small-12 category-column"> <ul class="vertical menu expanded"> <li class="sub-heading"> <a href="/support">Support<svg class="mobile-navigation-arrow icon-svg icon-chevron-right"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-right"></use> </svg></a> </li> <div class="link-list column column-block"> <div class="category-shop"><a class="category-links">Customer services<svg class="mobile-navigation-arrow icon-svg icon-chevron-down"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-down"></use> </svg></a> <div class="category-links-content"> <ul> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/contact"> <span>Contact</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/returns" analyticscategory="Top nav"> <span>Returns</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/account/account-dashboard#product-registration" analyticscategory="Top nav"> <span>Product registration</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/articles-faq-customer-service"> <span>Articles and FAQs</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/returns/warranty-home" analyticscategory="Top nav"> <span>Warranty Status</span> </a> </div> </li> </ul> </div> </div> </div> <div class="link-list column column-block"> <div class="category-shop"><a class="category-links">Tools & resources<svg class="mobile-navigation-arrow icon-svg icon-chevron-down"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-down"></use> </svg></a> <div class="category-links-content"> <ul> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/ssd-support" analyticscategory="Top nav"> <span>Firmware updates</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="https://www.acronis.com/en-sg/promotion/CrucialHD-download/" analyticscategory="Top nav"> <span>Acronis data transfer</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/storage-executive" analyticscategory="Top nav"> <span>Storage Executive</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/store/advisor"> <span>Upgrade Advisor</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class="system-scanner-menuitem-link text-left primary " href="/store/systemscanner" data-custom-class="system-scanner-menuitem-link"> <span>System scanner</span> </a> </div> </li> </ul> </div> </div> </div> <div class="link-list column column-block"> <div class="category-shop"><a class="category-links">Self help<svg class="mobile-navigation-arrow icon-svg icon-chevron-down"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-down"></use> </svg></a> <div class="category-links-content"> <ul> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/memory/memory-buying-guide" analyticscategory="Top nav"> <span>Memory buying guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/products/ssd/ssd-buying-guide" analyticscategory="Top nav"> <span>Storage buying guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-memory/how-to-upgrade-desktop-memory" analyticscategory="Top nav"> <span>RAM installation guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/ssd/ssd-install" analyticscategory="Top nav"> <span>SSD installation guide</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/articles-faq-ssd" analyticscategory="Top nav"> <span>SSD FAQs</span> </a> </div> </li> <li> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/support/articles-faq-memory"> <span>Memory FAQs</span> </a> </div> </li> </ul> </div> </div> </div> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> </div> <div class="link-list column column-block"> </div> </ul> </div> </div> </li> </ul> </li> </ul> <div class="button-wrapper upgrade-computer"> <div class="simple-link text-left " data-magellan data-bar-offset="50"> <a class=" text-left button primary " href="/upgrades"> <span>Upgrade my computer</span> </a> </div> </div> </div> <div class="button-wrapper crucial-garage hide"> <button type="button" data-toggle="garage-dropdown"> <span class="garage-icon"> <svg class="icon-svg icon-scanned-system"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-scanned-system"></use> </svg> </span> <span class="show-for-large my-computer-section"> <span class="my-computer-title">My computer</span> <span class="my-computer"></span> </span> </button> </div> <div class="mobile-nav--hamburger hide-for-large" data-responsive-toggle="responsive-header-mega" data-hide-for="large"> <div id="js-mobile-icon" data-toggle="responsive-header-mega"> <svg class="icon-svg icon-menu"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-menu"></use> </svg> <svg class="icon-svg icon-x"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-x"></use> </svg> </div> </div> </div> </nav> </div> </div> </header> <div class="garage dropdown-pane" data-position="bottom" data-alignment="right" id="garage-dropdown" data-dropdown> <div class="row"> <div class="columns large-7 small-12"> <h4>Currently shopping for</h4> <div class="garage-current-result-section"> <div class="mycomputer-current-section"> <div class="currentcomputer"><svg class="icon-svg icon-subtract"> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-subtract"></use> </svg> <svg class="icon-svg icon-complete"> <use 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xlarge]" class="section dark-theme " role="img" aria-label=" "> <div class="row "> <div class="basecomponent zurbcolumn parbase columns large-1 hide-for-medium default-theme uphill slantleft"> <div class="zurbcolumn-container"> </div></div> <div class="basecomponent zurbcolumn parbase columns small-12 medium-5 large-5 dark-theme uphill slantleft"> <div class="zurbcolumn-container"> <div class="container basecomponent parbase"> <div class=" margin-top--small margin-bottom--small tablet-margin-top--medium tablet-margin-bottom--medium"> <div class="container-content top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="container basecomponent parbase"> <div class="container-content desktop-padding-bottom--medium top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="simplelink basecomponent parbase"> <div class="simple-link simple-link--icon text-left " data-magellan data-bar-offset="50"> <a class=" text-left primary " href="/articles/about-memory"> <span class="icon">  <svg class="icon-svg icon-chevron-left "> <use href="/etc.clientlibs/core/clientlibs/resources/icons-sprite.svg#icon-chevron-left"></use> </svg>  </span> <span>About memory</span> </a> </div> </div> </div> </div> </div> </div> <div class="contentheader basecomponent parbase"> <h1 class="reverse-color "> <span>The difference between RAM speed and CAS latency</span> </h1> </div> </div> </div> </div> </div></div> </div></div> <div class="basecomponent zurbcolumn parbase columns small-12 medium-7 large-7 default-theme uphill slantleft"> <div class="zurbcolumn-container"> <div class="container basecomponent parbase"> <div id="header-image-container-2" data-magellan-target="header-image-container-2" class=" margin-top--medium margin-bottom--medium"> <div class="container-content top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="image basecomponent parbase"> <div class="imagewidth-attributes" id="zurbrow_copy_1854910zurbcolumn2contentcontainercontainerContentimage"> <img data-interchange="[/content/dam/crucial/dram-products/ddr5-pro/overclocking/images/web/crucial-DDR5-pro-overclocking-image-mobile-5.psd.transform/small-jpg/img.jpg, small], [/content/dam/crucial/dram-products/ddr5-pro/overclocking/images/web/crucial-DDR5-pro-overclocking-image-mobile-5.psd.transform/medium-jpg/img.jpg, medium]" data-type="src" title="Rebuilding a computer" alt="Install RAM in computer" style="max-width:100%;"/> </div> </div> </div> </div> </div> </div></div> </div></div> </div> </div> </div> <div class="zurbrow basecomponent parbase"> <div data-interchange="[, small], [, medium], [, large] ,[, xlarge]" class="section --bottom-only " aria-label=" "> <div class="row align-center padding-top--small tablet-padding-top--medium"> <div class="basecomponent zurbcolumn parbase columns small-12 medium-5 large-5 hide-for-small-only default-theme uphill slantleft"> <div class="zurbcolumn-container"> <div class="inpagenavigation basecomponent parbase"> <nav class="sticky-container hide-for-small-only" data-sticky-container> <div class="sticky" data-sticky data-anchor="anchor" data-margin-top="8"> <div> </div> <ul class="vertical menu" data-smooth-scroll data-offset="120"> <li> <a class='animated-link' href="#what"> <span class='arrow -enlarged'></span> <span class='arrow -short'></span> <span class='text'>What is CAS latency and the latency equation? </span> </a> </li> <li> <a class='animated-link' href="#perception"> <span class='arrow -enlarged'></span> <span class='arrow -short'></span> <span class='text'>The perception and the truth about latency </span> </a> </li> <li> <a class='animated-link' href="#latency"> <span class='arrow -enlarged'></span> <span class='arrow -short'></span> <span class='text'>The latency paradox </span> </a> </li> <li> <a class='animated-link' href="#ram"> <span class='arrow -enlarged'></span> <span class='arrow -short'></span> <span class='text'>What is RAM speed? </span> </a> </li> <li> <a class='animated-link' href="#important"> <span class='arrow -enlarged'></span> <span class='arrow -short'></span> <span class='text'>Which is more important: RAM speed or CAS latency? </span> </a> </li> </ul> </div> </nav></div> </div></div> <div id=" foo" class="basecomponent zurbcolumn parbase columns medium-7 large-7 default-theme uphill slantleft"> <div class="zurbcolumn-container"> <div class="container basecomponent parbase"> <div id="anchor" data-magellan-target="anchor" class=" margin-top--small"> <div class="container-content padding-bottom--small top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="dynamicmetadata basecomponent parbase"> <h5> <i>Updated</i> <b>March 27, 2025</b> <i>in</i> <a title="About Memory">About Memory</a> </h5> </div> <div class="text parbase"> <p><a href="https://www.crucial.com/catalog/memory">RAM</a> (Random-access memory) is an essential component of your computer. It is the temporary work area for your applications and operating system when your computer is running, so the faster your RAM, the faster your overall system performance. </p> <p>Memory speed can be measured in several ways. One measure of speed is in Mhz, which is a measure of the clock speed, or frequency of the RAM. The higher the clock speed, the faster the RAM can operate.</p> <p>Another measure is bandwidth, which measures how quickly the memory chips can move data.</p> <p>This article will focus on memory latency and CAS speed and the relationship between them because this relationship is another way to measure system performance.  While the two are closely related, they're not connected in the way you might think. </p> <p>Here's how speed and latency are related at a technical level — and how you can use this information to optimize your memory's performance. </p> <p>Read our article on computer memory to find out <a href="https://www.crucial.com/articles/about-memory/does-my-computer-need-more-memory">how much memory your computer should have</a>.</p> <p>Latency is a measure of the time delay between when a command is entered and when the data is available.</p> </div> <div class="anchor basecomponent parbase"> <a id="what" data-magellan-target="what"></a> </div> <div class="contentheader basecomponent parbase"> <h2> <span>What is CAS latency and the latency equation? </span> </h2> </div> <div class="text parbase"> <p>At a basic level, latency refers to the time delay between when a command is entered and when the data is available. Latency is the gap between these two events. When the memory controller tells the memory to access a particular location, the data must go through a number of clock cycles in the column address strobe (CAS) to get to its desired location and complete the command. Two main variables determine a module's latency:</p> <ol> <li>The total number of clock cycles the data must go through (measured in CAS latency, or CL, on data sheets)</li> <li>The duration of each clock cycle (measured in nanoseconds) </li> </ol> <p>Combining these two variables gives us the latency equation: </p> <p style="margin-left: 40.0px;">latency (ns) = clock cycle time (ns) x number of clock cycles </p> <p>In the history of memory technology, as speeds have increased (which means clock cycle times have decreased), the CAS latency values have also increased.   However, because of the faster clock cycle, the true latency as measured in nanoseconds has remained roughly the same. By optimizing the balance between the maximum speed your processor is capable of and the lowest latency memory available within your budget, you can achieve a higher level of performance using newer, faster, and more efficient memory. <br> </p> </div> <div class="contentheader basecomponent parbase"> <h3> <span>How can I check the CAS latency (CL) timings of my RAM?</span> </h3> </div> <div class="text parbase"> <p>You can check the CAS latency (CL) timings of your RAM using Crucial tools. The Crucial System Scanner provides detailed information about your system's memory, including CAS latency. Here's how you can do it:</p> <ol> <li><b>Download the Crucial System Scanner:</b> Visit the <a href="/store/systemscanner">Crucial System Scanner</a> page and click on "Start my free scan."</li> <li><b>Run the Scanner:</b> Open the downloaded file (CrucialScan.exe) and run it. The scanner will analyze your system's memory and storage setup.</li> <li><b>View Results:</b> After the scan is complete, you'll see a detailed report that includes your RAM's CAS latency, along with other useful information about your system's memory and storage.</li> </ol> </div> <div class="anchor basecomponent parbase"> <a id="perception" data-magellan-target="perception"></a> </div> <div class="contentheader basecomponent parbase"> <h2> <span>The perception and the truth about latency</span> </h2> </div> <div class="contentheader basecomponent parbase"> <h3> <span>Perception</span> </h3> </div> <div class="text parbase"> <ul> <li>Many users believe CAS latency is an accurate indicator of real world latency performance</li> <li>Many users also believe that because CAS latencies increase with speed gains, some of the speed gets nullified</li> </ul> </div> <div class="contentheader basecomponent parbase"> <h3> <span>Truth</span> </h3> </div> <div class="text parbase"> <ul> <li>Semiconductor engineers know that CAS latencies are an inaccurate indicator of performance<br> </li> <li>Latency is best measured in nanoseconds, which is a combination of speed and CAS latency</li> <li>Both speed increases and latency decreases result in better system performance<br>  </li> </ul> <p>Example: because the latency in nanoseconds for DDR4-2400 CL17 and DDR4-2666 CL19 is roughly the same, the higher speed DDR4-2666 RAM will provide better performance</p> <p>Example: if the speed rating of a standard module and a gaming module is the same (i.e. DDR4-2666) but the CAS latencies are different (i.e. CL16 vs. CL19), then the lower CAS latency will provide better performance</p> <p>The difference between the perception of latency and the truth of latency comes down to how latency is defined and measured.</p> </div> <div class="anchor basecomponent parbase"> <a id="latency" data-magellan-target="latency"></a> </div> <div class="contentheader basecomponent parbase"> <h2> <span>The latency paradox</span> </h2> </div> <div class="text parbase"> <p>Latency is often misunderstood because of product flyers and spec comparisons. It's usually noted as CAS latency (CL), which is only half of the latency equation. Because CL ratings indicate only the total number of clock cycles, they don't have anything to do with the duration of each clock cycle, and thus, they shouldn't be extrapolated as the sole indicator of latency performance.<br> </p> <p>By looking at a module's latency in terms of nanoseconds, you can best judge if one module is, in fact, more responsive than another. To calculate a module's latency, multiply the clock cycle duration by the total number of clock cycles. These numbers will be noted in official engineering documentation on a module's datasheet.<br> </p> </div> <div class="anchor basecomponent parbase"> <a id="ram" data-magellan-target="ram"></a> </div> <div class="contentheader basecomponent parbase"> <h2> <span>What is RAM speed?</span> </h2> </div> <div class="text parbase"> <p>RAM speed is essentially how quickly your computer's memory can process data, measured in megahertz (MHz). Faster RAM speeds mean quicker data access, which can boost your computer's performance, especially for tasks that require a lot of memory like gaming or video editing. However, it's not just about speed; the size, type, and timings of the RAM also play important roles in overall performance. So, it's best to consider all these factors together to get the most out of your computer.</p> </div> <div class="contentheader basecomponent parbase"> <h3> <span>How to tell what your RAM speed is</span> </h3> </div> <div class="text parbase"> <p>You can also check your RAM speed on your computer by using the Crucial System Scanner tool. The Crucial System Scanner is a free tool that scans your system to provide detailed information about your memory and storage, including RAM speed. Here's how you can use it:</p> <ol> <li><b>Download the Crucial System Scanner:</b> Visit the <a href="/store/systemscanner">Crucial System Scanner</a> page and click on "Start my free scan."</li> <li><b>Run the Scanner: </b>Open the downloaded file (CrucialScan.exe) and run it. The scanner will analyze your system's memory and storage setup.</li> <li><b>View Results:</b> After the scan is complete, you'll see a detailed report that includes your RAM speed, along with other useful information about your system's memory and storage.</li> </ol> <p>This tool is safe to use and doesn't install anything on your computer. If you need further assistance finding CAS latency timings or RAM speed feel free to contact support.</p> <p> </p> </div> <div class="anchor basecomponent parbase"> <a id="important" data-magellan-target="important"></a> </div> <div class="contentheader basecomponent parbase"> <h2> <span>Which is more important: RAM speed or CAS latency?</span> </h2> </div> <div class="text parbase"> <p>Based on in-depth engineering analysis and extensive testing in the Crucial performance lab, the answer to this classic question is BOTH! Speed and latency both play a critical role in system performance. So, when you’re looking to upgrade, we recommend:</p> <ul> <li>Step 1: Identify the highest memory speed supported by both your processor and motherboard (including <a href="/articles/about-memory/what-is-overclocking">overclocking profiles</a>)<br> </li> <li>Step 2: Select the lowest latency memory that fits within your budget at that speed, remembering that a superior (i.e. lower) latency means superior system performance<br> </li> </ul> <p>To find out more about how our products can help you with RAM speed and CAS latency, browse our <a href="/catalog/memory" target="_blank">Crucial memory</a> products. Also, be sure to navigate to our <a href="/store/advisor" target="_blank">Crucial Upgrade Selector</a> or <a href="/store/systemscanner" target="_blank">System Scanner</a> to see what RAM is compatible with your computer.</p> </div> </div> </div> </div> </div></div> </div></div> </div> </div> </div> <div class="container basecomponent parbase"> <div class="container-content padding-top--small top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="contentheader basecomponent parbase"> <h2 class="primary-color "> <span>People also viewed</span> </h2> </div> </div> </div> </div> </div> <div class="container basecomponent parbase"> <div class="container-content padding-top--small padding-bottom--small top-left auto-dismiss " data-toggler data-animate="fade-in fade-out" data-closable> <div class="row"> <div class="columns small-12"> <div class="dynamicCardLayout basecomponent parbase"> <div id="dynamiccardlayout" class="card " resultsPerPage="12" show-pagination="false"> <div class="row small-up-1 medium-up-3 large-up-3" data-equalizer="card"> <div class="column column-block "> <article class="card-container card dynamic-layout card-default" data-equalizer-watch="card"> <div class="card-content"> <div class="card-thumb"> <a class="card-url" href="/articles/about-memory/how-much-ram-does-my-computer-need"> <div class="card-image" data-interchange="[/content/dam/crucial/dram-products/ddr5-pro/overclocking/photography/in-use/crucial-ddr5-pro-overclocking-inuse-15.psd.transform/small-jpg/img.jpg, small]" style="background-position:center center;" title="Crucial RAM in motherboard" role="img" aria-label="Crucial RAM in motherboard"></div> </a> </div> <div class="card-info-wrapper"> <div class="card-info"> <a class="card-url" href="/articles/about-memory/how-much-ram-does-my-computer-need"> <h3 class="card-title">How much RAM do you need for your computer memory</h3> </a> <hr/> <p class="card-text line-clamp line-clamp-4">How much RAM do you need? 4GB, 8GB, 16GB, 32GB - or even 64GB? 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