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Power Mac G5
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== P.A. Semi's G5 derivative == When [[P.A. Semi]] announced the preliminary pre-production plan of [[PWRficient]] processor,<ref>{{cite web |url=http://www.eetimes.com/news/latest/showArticle.jhtml?articleID=172303041 |title=PowerPC play: He shoots ... |access-date=June 27, 2008 |last=Merritt |first=Rick |date=October 24, 2005 |work=[[EE Times]] |publisher=[[United Business Media]] |archive-date=March 5, 2012 |archive-url=https://web.archive.org/web/20120305220857/http://www.eetimes.com/news/latest/showArticle.jhtml?articleID=172303041 |url-status=live }}</ref> there had been persistent rumors that Apple would prepare for its use in its professional line of personal computers.<ref>{{cite web |url=http://www.linleygroup.com/npu/Newsletter/wire051110.html |title=The Linley Group |access-date=June 27, 2008 |last=Gwennap |first=Linley |author2=Bob Wheeler |author3=Jag Bolaria |author4=Joseph Byrne |date=November 10, 2005 |work=The Linley Wire |publisher=The Linley Group |url-status=dead |archive-url=https://web.archive.org/web/20080819151249/http://www.linleygroup.com/npu/Newsletter/wire051110.html |archive-date=August 19, 2008 |df=mdy-all }}</ref> In 2006, ''[[The Register]]'' reported that [[P.A. Semi]] had formed a tight relationship with Apple, which would result in P.A. Semi promptly delivering processor chips for Apple's personal computer notebook line and possibly desktops.<ref>{{cite web |url=http://www.theregister.com/2006/05/19/pasemi_apple/ |title=Apple shunned superstar chip start-up for Intel |access-date=June 27, 2008 |last=Vance |first=Ashlee |author-link=Ashlee Vance |date=May 19, 2006 |work=[[The Register]] |archive-date=March 6, 2013 |archive-url=https://web.archive.org/web/20130306003732/http://www.theregister.co.uk/2006/05/19/pasemi_apple/ |url-status=live }}</ref> Even in 2006, Apple did not have a laptop version of the G5 processor. The processor that would run the personal computers was P.A. Semi's preliminarily proposed processor, [[PWRficient]] 1682M (PA6T-1682M). The version that would be sampled for pre-production at third quarter of 2006 was a 2 GHz, dual-core CPU with two DDR2 memory controllers, 2 MB of L2 cache, and support for 8 PCI Express lanes. The sampled chip also has lower heat intensity than Intel's [[Core Duo]], which gives off 9β31 W under normal load. According to ''The Register'' article, P.A. Semi executives believed that they were all but assured of winning Apple's contract, and CEO [[Dan Dobberpuhl]] thought that Apple's hints of moving to Intel were just a persuading tactic. At the time, the companies were working for PWRficient software. Despite the advantages of more compatible architecture, Apple moved to the Intel architecture officially for 'performance-per-watt' reasons. However, P.A. Semi would not be able to ship its low-power multicore product in volume until 2007, which, combined with P.A. Semi's status as a start-up company, seems to have been the final blow to the development of Power Mac computers. However, it was also speculated that Apple switched to Intel processor because Apple could no longer abide the constant delays in performance ramp up,<ref>{{cite web |url=https://arstechnica.com/news.ars/post/20051026-5486.html |title=P.A. Semi's major PowerPC announcement, and looking back at The Switch |access-date=June 27, 2008 |last=Stokes |first=Jon |date=October 26, 2005 |work=[[Ars Technica]] |archive-date=April 29, 2008 |archive-url=https://web.archive.org/web/20080429202322/http://arstechnica.com/news.ars/post/20051026-5486.html |url-status=live }}</ref> desired native [[Microsoft Windows|Windows]] compatibility, or it was Apple's strategy to shift its business focus away from desktop computing to [[iPod]] (and subsequently [[iOS (Apple)|iOS]]) development. Apple acquired P.A. Semi in 2008,<ref>{{cite news|title=Apple Buys Chip Designer |work=[[Forbes]] |url=https://www.forbes.com/technology/2008/04/23/apple-buys-pasemi-tech-ebiz-cz_eb_0422apple.html |access-date=2008-04-23 |url-status=dead |archive-url=https://web.archive.org/web/20080424162510/http://www.forbes.com/technology/2008/04/23/apple-buys-pasemi-tech-ebiz-cz_eb_0422apple.html |archive-date=April 24, 2008 }}</ref> using P.A. Semi's engineering resources to develop ARM CPUs for their [[iPhone]], [[iPod Touch]], [[iPad]], and [[Apple TV]] product lines; and would go on to eventually come full circle with [[Mac transition to Apple silicon|these designs replacing Intel chips]] in Macs in 2020.<ref>{{cite news | title=A Little Chip Designed by Apple Itself | url=https://www.nytimes.com/2010/02/02/technology/business-computing/02chip.html | access-date=2010-02-02 | work=[[The New York Times]] | first1=Ashlee | last1=Vance | first2=Brad | last2=Stone | date=2010-02-02 | archive-date=August 15, 2017 | archive-url=https://web.archive.org/web/20170815233431/http://www.nytimes.com/2010/02/02/technology/business-computing/02chip.html | url-status=live }}</ref> The PA6T-1682M processor would later be used by the [[AmigaOne X1000]] personal computer.
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