Being relatively new to my Quad, I have yet to learn EVERYTHING about it, although my enthusiasm for the machine has helped. I've added a second HDD, two 7800GT's, Leopard and Tiger, as well as multiple games and software packages. One of these included temperature monitor which I like to put in my menu, vainly displaying the temps of all four cores. I also used Onyx to install the Processor system preference panel, which is very cool indeed. But one thing has been bugging me lately about my core temperature. Namely, core 2 (aka. Core B on Chip 1) always seems to be more than 20*C higher than other cores during direct usage, and around 10*C higher on idle. Most cores go up to 50*C or so, but core 2 flys up as far as 75*C. In fact I sometimes wonder when my fans burst into life, that if they are only doing so for that one damn core. An idea of what I mean: Do any Quad owners here have the same story? Is this normal?