New Computer crashing

Last night I built my computer and installed windows 7 and everything else and today when I was playing BF3 it crashed twice after about 30 minutes of playing. I just hear the audio stuttering then I lose the picture and then the BIOS shows up.
I have
-Intel i7 3820 (not overclocked)
-Evga GTX680
-Asrock x79 extreme 6
-Corsair AX1200
Then an hyper 212 evo cpu cooler

So it crashes during load not during idle because last night when i was moving things over it didnt have any problems.
Could it the cpu getting too hot or what?

Edit:Alright just ran prime 95 for 30 mins and used real temp to monitor it. Worked fine and now im going to stress test the gpu.