hey i have an asus mobo and it has an overclocking program so it will autom aticly overclock when its understress to let it catchup with itself. well when i go into the bios i try to do it manualy and i would set it to be overclocked 20% at all times. NOTE* i have seen it overclocked to 30% with no problem many times. now when i do this i also upo my voltage on the CPU i stick the ram voltage and FSB on auto, and when i try to restart my system hangs. my 6600GT is overclocked just fine i just have a little trouble keeping it overclocked permenantly. why?