Editing PowerPC G4 (section)

==PowerPC 7447 and 7457==
The PowerPC 7447 "Apollo 7" is slightly improved from the 7450/55, it has a 512 KB on-chip L2 cache and was manufactured in a [[130 nanometer|130&nbsp;nm]] process with SOI, hence drawing less power. It has 58 million transistors. With the 7447A, which introduced an integrated thermal diode as well as DFS ([[dynamic frequency scaling]]) Freescale was able to reach a slightly higher clock.{{Clarify|date=August 2009}} The 7447B is effectively a 7447A with even higher frequency scaling, with clock rates up to 1.7&nbsp;GHz officially and easily up to 2.4&nbsp;GHz through [[overclocking]].<ref>[https://web.archive.org/web/20151020175158/http://www.freescale.com/files/shared/doc/pcn/PCN11161.htm FREESCALE PRODUCT BULLETIN 11161]</ref><ref>[https://www.nxp.com/docs/en/reliability-and-quality-information/MC7447AQUAL.pdf MC7447A/B/C Microprocessor MOS-13 HiP7SOI 41 - L25S / 42 - L25S / 53 – L25S / 55 – L25S / 58 – L25S Qualification Report]</ref> The 7457 and 7457A have an additional L3 cache interface, supporting up to 4 MB of L3 cache, up from 2 MB supported by the 7455 and 7450. However, its frequency scaling stagnated when Apple chose to use the 7447(s) instead of the 7457(s), despite the 7457 being the L3 cache-enabled successor to the L3 cache-enabled 7455 that Apple used before.

The only companies that offer the 7457 in the form of upgrades for the [[Power Mac G4]], [[iMac G4]], and [[Power Mac G4 Cube]] are Giga Designs, Sonnet Technology, Daystar Technology (they use the 7457 only for iMac G4 upgrades) and PowerLogix. The [[Pegasos]] computer platform from [[Genesi]] also uses 7447 in its Pegasos-II/G4.

The 7457 is often used to repair an AmigaOne XE CPU module;<ref>{{Cite web|url=http://www.intuitionbase.com/printstatic.php?section=en_cpu-repair&char=|title=IntuitionBase - Your Guide To AmigaOS4.x And The AmigaOne|website=www.intuitionbase.com|access-date=2018-07-12|archive-date=2021-06-10|archive-url=https://web.archive.org/web/20210610214905/http://www.intuitionbase.com/printstatic.php?section=en_cpu-repair&char=|url-status=dead}}</ref><ref>{{Cite web|url=https://www.amigans.net/modules/xforum/viewtopic.php?forum=4&topic_id=7503&order=|title=AmigaOne XE, manual cites incorrect vCore?? [Forums - AmigaOS4] - The Amigans website|website=www.amigans.net}}</ref><ref>{{cite press release |author=<!--Staff writer(s); no by-line.--> |url=http://www.acube-systems.biz/index.php?page=news&id=1|title=ACube Systems new corporate website|location=Bassano del Grappa, Italy |publisher=ACube|date=February 24, 2007|access-date=June 12, 2014}}</ref><ref>{{cite web |url=http://www.amiga-news.de/de/news/AN-2007-02-00084-EN.html|title=ACube Systems: Company web page|publisher=Amiga-News.de|date=February 25, 2007|access-date=June 11, 2014}}</ref> some [[AmigaOS]] software with the 7457 installed may mistake the AmigaOne for a Pegasos II computer as there were never any official 7457 boards released by [[Eyetech]].