speaking of the power supply...when you boot what voltages are you seeing on your rails?....are all of them near or a little above the specs? (which you want).....or do you see a dip in one of them such as your 12V reading 11.5 or something (which is not a good thing)a low voltage rail especially on the 12V rail can cause system instability under heavy loads, since the processor runs entirely on it along with other case fans, harddrive etc...