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 [Adinoto.blogspot.com] adinoto's blog: Why Low Powered (Cooler) Chip Is Matter: First Generation PowerMac G5 (PowerPC 970) produce 51Watt @ 1.8GHz .Now compare it to a G4 (Motorola/Freescale PowerPC 74xx): .

 [News.surfwax.com] SurfWax: News, Reviews and Articles On G4: Meanwhile, Freescale Semiconductor Inc., the Austin, Texas, company that spun off from Motorola in 2004 and makes the G4 chips used in Apple laptops, also tried to downplay the loss of Apple .One of the biggest questions for Apple has been whether the computer-maker will be able to upgrade its lineup of laptop computers from PowerPC G4 chips to PowerPC G5 chips, which Apple Executive Vice President Tim Cook has called "the mother of all thermal challenges.".

[Smerpology.org] Snort a Sprocket: "Time for a Brain Transplant": It’s unclear that IBM or Freescale had the ability (or desire, for that matter) to spend the time and money necessary on getting the power + heat down for a mobile version of the PPC 970. All indications is that if it could have been done, neither company was willing or able to make it a priority.

[Www-128.ibm.com] Unrolling AltiVec, Part 1: Introducing the PowerPC SIMD unit: The original G4 needs thefewest cycles per instruction, but can run fewer instructions at a time;the G5 needs the most cycles per instruction, but can run more at a time.There are a number of additional complexities involved, but in general,for a given clock speed, the G5 will get the most work done onwell-pipelined code. Ironically, however, badly pipelined code may run infewer cycles on an older processor.

Reflected tags on Technorati: Blog, G5, Love The Mac