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In fact, due to the size of the upgrade card, the processor direct slot cannot be used with the PPC upgrade card, very much limiting expansion options.</p> <p>This upgrade is not compatible with the 040 PDS in the Centris line, the Quadra 610, or the Quadra 650-950. These models work with the <a href="http://lowendmac.com/Users/dknight/Dropbox/lowendmac.com/2016/powerpc-601-upgrades-for-68040-pds-macs/">Apple Power Mac Upgrade Card</a> and equivalents from DayStar and Sonnet.</p> <p><img decoding="async" class="alignleft wp-image-42650 size-full" src="http://lowendmac.com/wp-content/uploads/wa-pwrcrd601.png" alt="DayStar PowerCard 601" width="168" height="135" srcset="https://lowendmac.com/wp-content/uploads/wa-pwrcrd601.png 168w, https://lowendmac.com/wp-content/uploads/wa-pwrcrd601-160x129.png 160w" sizes="(max-width: 168px) 100vw, 168px" />The APMPU was built by DayStar, which sold two versions under the PowerCard 601 name. The initial version uses a 66 MHz PowerPC 601 CPU and runs at double the clock speed of the Mac’s original CPU. The later version runs at 100 MHz.</p> <p>After DayStar went out of business, <a href="http://www.sonnettech.com/">Sonnet Technologies</a> picked up DayStar’s 100 MHz design and sold it as the Presto PPC upgrade, which has since been discontinued.</p> <p>The APMPU requires <a href="http://lowendmac.com/2014/system-7-5-and-mac-os-7-6-the-beginning-and-end-of-an-era/">System 7.5</a> or later and at least 8聽MB of installed RAM.</p> <p>All three versions of the card are compatible with <a href="http://lowendmac.com/2014/mac-os-8-and-8-1-maximum-size-maximum-convenience/">Mac OS 8.1</a>; with Sonnet’s drivers, the Presto PPC card also supports Mac OS 8.5-8.6.</p> <h3>Apple</h3> <ul> <li>requires “fat” System 7.5 to 8.1 to support both 68040 and PowerPC 601 CPUs</li> <li>requires Apple “Power Macintosh Card” control panel</li> <li>CPU: 66 MHz PowerPC 601</li> <li>CPU speed: runs at twice the speed of installed 68040 CPU <ul> <li>50 MHz in LC 475, Performa 475-476, and Quadra 605</li> <li>66 MHz in 33 MHz models</li> </ul> </li> <li>ROM: Apple PowerPC ROMs</li> <li>RAM: uses memory on computer motherboard</li> <li>L2 cache: 256 KB</li> </ul> <h3>DayStar PowerCard 601-50/66</h3> <ul> <li>requires “fat” System 7.5 to 8.1 (only certified to 7.5.1)</li> <li>requires Daystar “PowerPro” or Apple “Power Macintosh Card” control panel</li> <li>CPU: 66 MHz PowerPC 601, runs at 2x original CPU speed</li> <li>ROM: Apple PowerPC ROMs</li> <li>RAM: uses memory on computer motherboard</li> <li>L2 cache: 256 KB</li> </ul> <h3>DayStar PowerCard 601-100</h3> <ul> <li>requires “fat” System 7.5 to 8.1 (only certified to 7.5.1)</li> <li>requires Daystar “PowerPro” or Apple “Power Macintosh Card” control panel</li> <li>CPU: 100 MHz PowerPC 601, runs at 100 MHz</li> <li>ROM: Apple PowerPC ROMs</li> <li>RAM: uses memory on computer motherboard</li> <li>L2 cache: 256 KB</li> </ul> <h3>Details, Sonnet Presto PPC 605</h3> <ul> <li>requires “fat” System 7.5 to 8.1, Mac OS 8.5-8.6 with Sonnet enabler</li> <li>requires Sonnet’s Mac OS Enabler software</li> <li>CPU: 100 MHz PowerPC 601</li> <li>ROM: Apple PowerPC ROMs</li> <li>RAM: uses memory on computer motherboard</li> <li>L2 cache: 256 KB</li> </ul> <h3>Online Resources</h3> <ul> <li><a href="http://www.mathdittos2.com/columns/view/v000207.html">Performa 575 to Power Mac 575</a>, Steve Wood’s View from the Classroom, 2000.02.07</li> <li><a href="https://web.archive.org/web/20020817155956/http://docs.info.apple.com/article.html?artnum=16722"> Macintosh Processor Upgrade: Description</a>, Apple TIL 16722</li> <li><a href="https://en.wikipedia.org/wiki/Macintosh_Processor_Upgrade_Card">Macintosh Processor Upgrade Card</a>, Wikipedia</li> <li><a href="http://lowendmac.com/daystar/pages/dsd_products/upgrades/601/pwrcrd601spec.html">DayStar PowerCard 601 PowerPC Processor Upgrade for Entry Level Macs</a>, DayStar</li> <li><a href="https://web.archive.org/web/20010221150105/http://macuser.zdnet.com/mu_0795/turbo601.html">DayStar Turbo 601, Apple Macintosh Processor Upgrade, and DayStar PowerCard 601</a>, MacUser, 1995.07</li> <li><a href="https://www.google.com/url?q=http://www.sonnettech.com/publicfiles/pdfs/pdf_manuals/prestoppc_lc_qsguide.pdf&sa=U&ved=0ahUKEwio4t7N693OAhXJBsAKHdr7ARoQFggUMAA&usg=AFQjCNFsu5frNLVbTbJn4geqJJtCzgBapw">Sonnet Presto PPC</a> (PDF), includes installation instructions</li> <li><a href="http://lowendmac.com/2016/the-unofficial-powerpro-homepage/">The Unofficial PowerPro Homepage</a></li> <li><a href="http://lowendmac.com/1998/low-end-macs-vintage-macs-group/">Vintage Macs</a>, the email list for 680×0-based Macs</li> <li>Apple Specs Online for upgraded <a href="http://support.info.apple.com/info.apple.com/applespec/applespec.taf?RID=125" class="broken_link" rel="nofollow"> LC 475/Quadra 605</a>, <a href="http://support.info.apple.com/info.apple.com/applespec/applespec.taf?RID=127" class="broken_link" rel="nofollow"> LC 575</a>, <a href="http://support.info.apple.com/info.apple.com/applespec/applespec.taf?RID=135" class="broken_link" rel="nofollow"> LC 580</a>, <a href="http://support.info.apple.com/info.apple.com/applespec/applespec.taf?RID=126" class="broken_link" rel="nofollow"> LC/Performa/Quadra 630 series</a></li> </ul> <h3>Cautions</h3> <ul> <li>You must have a “fat” system installed to use a PowerPC upgrade.</li> </ul> <p>Keywords: #apmpu #powercard601 #prestoppc</p> <p>Short link: http://goo.gl/kpoLbI</p> <p><em>searchwords: apmpu, powercard601, prestoppc</em></p> </div> <footer class="entry-meta entry-meta-footer"> </footer> </article> </div> </div> <div id="secondary" class="widget-area" role="complementary"> <div class="sidebar-right-section"><h2 class="displaynone">Affiliates</h2> <div class="textwidget"><p><script language=JavaScript src="//bullseye.backbeatmedia.com/bullseye/adserver/270/0/viewJScript?pool=3273&type=3158&zone=5000&redirect=aj"></script> </p> <h3>Affiliate Programs</h3> <p>Support 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