Q6600 3.2GHz / 1600 RAM

Page 2 - Seeking answers? Join the Tom's Hardware community: where nearly two million members share solutions and discuss the latest tech.
Good, for a minute I thought you were cranking up the CPU to an early death.

Did you ever try running base FSB 400, CPU multi 8 and RAM at 1:1 (multiplier 2 in MIT) to under clock it and see if it was the RAM or something else causing your problems?
 
I tried that and it crashed at windows. I started to think it was the CPU so I used a multiplier of 7 and FSB of 400 (2.8GHz CPU) and 800MHz RAM. Rated FSB was 1600.

I got to windows and started COD4, ran fine. Quit the game, opened up FireFox and the computer crashed.
 
Reset everything to default and run prime95 on your computer to see if everything passes without any overclocking. You might have a bad piece of hardware somewhere.