Random but rare freezing

[Firewind]

Lately, on rare occasions when multi-tasking, my computer will do a full freeze. The only thing I can do is pull the power.

At first I thought it may be the overclocking, so I started running everything at stock, but it still happens entirely at stock. I ran Prime95 for 16 hours without any errors, and I know that my max load temp of 58c is within safe bounds.

Where should I look?

 

[Firewind]

E6700 Processor

Antec 650w TruePower Trio

Dual ATI 1900XTX video cards in crossfire

7200 RPM 250gb WD harddrive

2gb Corsair XMS2 DDR2 800C4 ram - currently at 2.1v

Xi-Fi Fata1ity Gaming Sound Card

Asus P5W DH Deluxe MB

AOpen 18x DVD burner

Cooler Master Centurion 5 Case

 

[Firewind]

I think putting the ram up another .1v would void the warranty with Corsair. Could it be the power supply?

 

[Fedor]

Yeah I would have said PSU but you gave the specs, and you have a very decent PSU. Do you by any chance have a spare or a friend with a spare to try out another power supply?

Your RAM is def getting enough voltage. And your CPU is definitely cool enough as you said. However, your RAM may simply be defective. There are tests like memtest to check.

 

[Fedor]

Well just go here:
http://www.corsair.com/corsair/xms2.html
Find your exact model, open up the .pdf. It says at what voltage the sticks are tested (some are 1.9, some 2.1, some 2.2, etc). If yours is already at, or above, what is stated there, you shouldnt need to up the voltage anymore.