Editing PowerPC 970 (section)

==Northbridges==
Two dedicated [[Northbridge (computing)|northbridges]] for PowerPC 970-based computers were manufactured by IBM:

*CPC925{{snd}} Designed by Apple<ref>{{cite web|url=https://www.youtube.com/watch?v=iwsn27J_tlo  |archive-url=https://ghostarchive.org/varchive/youtube/20211221/iwsn27J_tlo |archive-date=December 21, 2021 |url-status=live|title=WWDC 2003 Keynote |via=YouTube |author=Steve Jobs, Apple |date= June 25, 2003|access-date=October 16, 2009}}{{cbignore}}</ref> and called the ''U3'' or the ''U3H'' (which supports [[Error-correcting code|ECC]] memory). It is capable of supporting up to two PowerPC 970s or PowerPC 970FXs and has two 550&nbsp;MHz unidirectional processor buses, a 400&nbsp;MHz [[DDR SDRAM|DDR]] memory controller, x8 [[Accelerated Graphics Port|AGP]] and a 400&nbsp;MHz 16-bit [[HyperTransport]] tunnel. It fabricated on a 130&nbsp;nm process. Additionally, there was an unreleased U3Lite northbridge in development for the PowerBook G5, which never made it to market.
*CPC945{{snd}} Designed by IBM and called ''U4'' by Apple, it is capable of supporting two PowerPC 970MPs and has two 625&nbsp;MHz unidirectional processor buses, two memory controllers that support up to 64&nbsp;GB of 533&nbsp;MHz DDR2 SDRAM with ECC capability and has a x16 [[PCI Express|PCIe]] lane and an 800&nbsp;MHz 16-bit HyperTransport tunnel. It is fabricated on a 90&nbsp;nm process.

A CPC965 northbridge was canceled. Slated for release in 2007, it was to be a uniprocessor-only northbridge. Its features were a 533&nbsp;MHz DDR2 controller that supported up to 8&nbsp;GB ECC memory, a 8x PCIe bus, integrated four-port [[Gigabit Ethernet]] with [[IPv4]] [[Transmission Control Protocol|TCP]]/[[User Datagram Protocol|UDP]] offloading, USB 2.0 ports, a [[Flash memory|Flash]]-interface. The northbridge contains an integrated [[PowerPC 400#PowerPC 405|PowerPC 405]] core to provide system management and configuration capabilities.<ref>LaPedus, Mark (March 10, 2006). [http://www.eetimes.com/news/semi/showArticle.jhtml?articleID=193101381 "IBM rolls low-power processors, IP cores"] {{Webarchive|url=https://web.archive.org/web/20070926220729/http://www.eetimes.com/news/semi/showArticle.jhtml?articleID=193101381 |date=September 26, 2007 }}. ''EE Times''.</ref>