my dads pentium D 950 3.4GHz i was just seeing how far i could OC it i got it to 4.42GHz FSB from 200 to 260 voltage 1.3 to 1.41V i ran prime 95 for 2 hours temps idle at 38 an on load for 2 hours 58 played crysis for a hour after prime all worked fine but ive got it back to 3.4GHz i was just seing how far i could go an all of this was with stock heatsing an fan how much further do u think is could go with a much better heatsink an fan