Editing Cell (processor) (section)

===PowerXCell 8i===
In 2008, IBM announced a revised variant of the Cell called the '''PowerXCell 8i''',<ref name="cbe-programming-handbok">{{Cite book |url=http://www.iman1.jo/iman1/images/IMAN1-User-Site-Files/Programming/CellBE_PXCell_Handbook_v1.11_12May08_pub.pdf |title=Cell Broadband Engine Programming Handbook Including the PowerXCell 8i Processor |date=May 12, 2008 |publisher=[[IBM]] |series=Version 1.11 |access-date=March 10, 2018 |archive-url=https://web.archive.org/web/20180311081221/http://www.iman1.jo/iman1/images/IMAN1-User-Site-Files/Programming/CellBE_PXCell_Handbook_v1.11_12May08_pub.pdf |archive-date=March 11, 2018 |url-status=dead}}</ref> which is available in QS22 [[BladeCenter|Blade Servers]] from IBM. The PowerXCell is manufactured on a [[65&nbsp;nm]] process, and adds support for up to 32&nbsp;GB of slotted DDR2 memory, as well as dramatically improving [[double-precision floating-point]] performance on the SPEs from a peak of about 12.8&nbsp;[[GFLOPS]] to 102.4&nbsp;GFLOPS total for eight SPEs, which, coincidentally, is the same peak performance as the [[NEC SX-9]] vector processor released around the same time. The [[Roadrunner (supercomputer)|IBM Roadrunner]] supercomputer, the world's fastest during 2008–2009, consisted of 12,240 PowerXCell 8i processors, along with 6,562 [[Opteron|AMD Opteron]] processors.<ref name="beyond3dpowerxcell">{{Cite web |date=May 2008 |title=IBM announces PowerXCell 8i, QS22 blade server |url=http://www.beyond3d.com/content/news/640 |url-status=dead |archive-url=https://web.archive.org/web/20080616190441/http://www.beyond3d.com/content/news/640 |archive-date=June 16, 2008 |access-date=June 10, 2008 |publisher=Beyond3D |df=mdy-all}}</ref> The PowerXCell 8i powered super computers also dominated all of the top 6 "greenest" systems in the Green500 list, with highest MFLOPS/Watt ratio supercomputers in the world.<ref name="The Green 500 list, Nov 2009 ">{{Cite web |title=The Green500 List - November 2009 |url=http://www.green500.org/lists/2009/11/top/list.php |url-status=dead |archive-url=http://archive.wikiwix.com/cache/20110223210120/http://www.green500.org/lists/2009/11/top/list.php |archive-date=February 23, 2011 |df=mdy-all}}</ref> Beside the QS22 and supercomputers, the PowerXCell processor is also available as an accelerator on a PCI Express card and is used as the core processor in the [[QPACE]] project.

Since the PowerXCell 8i removed the RAMBUS memory interface, and added significantly larger DDR2 interfaces and enhanced SPEs, the chip layout had to be reworked, which resulted in both larger chip die and packaging.<ref>{{Cite web |title=Packaging the Cell Broadband Engine Microprocessor for Supercomputer Applications |url=http://ecadigitallibrary.com/pdf/58thECTC/s31p4p67.pdf |url-status=dead |archive-url=https://web.archive.org/web/20140104204617/http://ecadigitallibrary.com/pdf/58thECTC/s31p4p67.pdf |archive-date=January 4, 2014 |access-date=January 4, 2014}}</ref>