well. The max temp is something like 80C. So you have nothing to worry about. But the cooler the better. Right now my idle temps on a p4 3.2 ghz (originally 3.0ghz) is about 50C, but that's just because I've been too lazy to clean the massive amounts of dust from the heatsink. So when I get that cleaned the idle temps should be around 40C. (and I'm happy with that)