Ok, I ran the ati tool to get max mem speed, a little over 511mhz and logged the temps, the max temp was 75.5 deg c. My question is, is this too hot to be running this card? Also, I see cooling kits for these cards, but to be honest, I have yet to come across a game i couldnt play with everything set at max speed. What i really want to know is, where does the heat come from? I'm no electrical genius, I was just wondering what generates so much heat? If you were able to cool the GPU to keep it's temp say below 50deg c could you over clock it to say 750mhz?? Realistically, what is the absolute fastest you could clock this card, and for that matter the CPU(p 3.2ghz prescott), if you had somthinng like chilled watercooling.