>>19
Intel rates their own processors' thermal design points under what they consider to be typical usage scenarios. For a P4-670 (3.8 GHz), that typical TDP is 115 W. IBM provides minimal information here, but http://www.anandtech.com/mac/showdoc.aspx?i=2436&p=3 takes an educated guess (supported by evidence from Apple's site) that the G5's typical TDP is 59 W and that its worst-case TDP is 80 W.

Looks to me that Intel runs much, much hotter than G5s. There are Pentium 4-powered Dell Optiplex boxes at my workplace that exhaust uncomfortably hot air out the back even when their processors have been idling for over 10 minutes.

No, I'm not bashing Apple, I'm just bashing Intel. :)