i have a problem here and i thought i could ask on here.. well when i play games my computer freezes and its only when i play games but i can play the game for an hour or 2 before it freezes.. there is no dirt or dust in the computer for it is brand new just built it a couple days ago.. and while playing battlefield 3 on max setting i am reaching temps of my CPU around 50 Celsius and my graphics card gets to around 30 Celsius.. and i have also ran virus scanners and has came back as no virus.. my specs are as fallows
ASRock Z79 Extreme 4
120 gig OCZ SSD
2TB Hitachi HDD
130 gig as a back up
Kingston Predator HyperX 8 gig (2X4)
Extreme Gear 1000 watt power supply
Geforce GTX 660 3 gig
Asetek 510LC liquid cooling
Test your RAM sticks individually using Memtest86+. More likely, however, your "1000W" PSU is a cheap generic unit that wanders out of spec under load. Does it have a little voltage switch on it?
A quality 500W unit would be sufficient for that system, such as anything built by Seasonic (their own, XFX, some Antec, high-end Corsair, some PC P&C), FSP (their own, some Antec), Delta (some Antec), Enermax/LEPA (their own), or Super Flower (new Rosewill, new Kingwin).
I wouldnt trust an xtreme gear psu as far as I could throw it. They are the same cheap generic garbage that ibuypower uses in their prebuilt systems. The PSU may not have enough amperage, or steady enough amperage.