Not sure where to start, but here goes. I picked up a new msi 7870 gpu a couple of weeks ago. Justa week after getting it it started to crash (black screen and had to reboot). i tried drivers and even installed new OS. The gpu is cool even in games (under 50c). Ram memtest all passed. So after a few days I figured it was a bad gpu, so I rma back to newegg. Got the new one yesterday, and played BF3 (3 games) and a couple of other games with no issues. So today I played games as usal and after a couple of hours of gamming, it did the same kind of crash. I can run my EVGA 470 just fine.
It plays well say durring 2-3 hours of play, them some times it won't go 15 min until it crashes.
i contacted msi and they said the gpu may not be compatible with my MB and to contact ASUS. I contacted ASUS, and there saying that a 3.0 gpu may not be compatible with my 2.0 MB. I have been told its backwards compatible.