at first i got it up to 2.9Ghz stable on prime95 for 13hrs (post 1) and then lhuser convinced me to push it to 3Ghz which it did for around 8hrs on prime95 both sessions had a maxium heat of 54-55 degrees C (post 8) it has been happily running at that ever since. the only thing i need to do now is make sure i keep the fan dust free or the temps will go up. plus having the memory that ive got really helped make it easy, i dont think i could of got it to 3Ghz without it