I've got a quad Mac Pro 2.66GHz. According to iStat Pro widget, my northbridge is a toasty 93 degrees. That's celcius When I was visiting my brother over the 4th of july, his Mac Pro was a lot louder, but his North Bridge was 53 Degrees. The procs are at 65, and the ambient is 33. Fans are about 550rpms except power supply is 900 something. is that typical for a warm summer afternoon in an upstairs room?