q6600 voltage question

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Ok guys, I tested the system for 18 Hrs yesterday with the first option in Prime95(In-place small FFT's). The strange thing is the system barely broke 53C(The other day it touched 60C when running In-place Large FFT's. So i thought everything was fine and stable. Yesterday night i started playing Crysis and after 20 Mins i guess, the system just powered down. I tried booting it again, Nothing happened. I had to reset the CMOS and boot back at 2.4 again. It was stable for around 10 Hrs on the lagre FFT tests and for 18Hrs on the small FFT test. So, why would it crash? Do you think its CPU related in the first place? Motherboard: Foxconn P35A, Memory:2GB wintec 800, Power supply 650 Watt BFG tech, Graphics: EVGA 8800GT. Please help Guys.