The Q6600 Processor was my problem "random shut downs" normally after 2-3 days. I replaced 2 hard drives, 1 power supply, 2 mother boards, 2 graphic cards, and one case (thought it was grounding out). It took me over 15 months to figure this out. It seems the 1% (NewEgg comments) of those who do not love this processor experienced the exact same problems. Always the last part before you torch your entire system and the least likely. Intel is in the process of replacing it, but talk about a great deal of time and money to figure it out.