I overclocked my AMD Athlon64 3000+ [Venice] from 1.81 to 2.16GHz with BIOS. When I try to play games, PC restarts. My temperature is below 30C. I overclocked CPU FSB Frequency from 200MHz to 240MHz, and i lowered HT Frequency from 5x to 3x. Why is my PC restarting if my CPU temp is low?