I just installed my brand new 7950 GT (the BFG OC'ed version), upgrading from my old 6800 GT. Well, now that I have the new card installed, I'm experiencing system lock ups in any game I play (I've tried 3 different ones). These tend to happen within 5 to 10 minutes of playing, depending on the game (Oblivion seems to do it the fastest). It's worth noting that my PC is NOT rebooting, however. It's just freezing up. I never had any problems of this nature with my old 6800. I've been on the phone with BFG support, and they suggested installing the older 91.47 forceware drivers (I was using the 93.71). They also suggested reinstalling DX9, both of which I've done.
Any one have any ideas? I suspect the problem is either an overheating core, or a defective card. Below are my system specs:
What are the temps of the video card under a load? Your power supply looks fine, so I doubt that is the problem. Try using nvtune, rivatuner or coolbits to underclock the video card. Try 10mhz at a time and see if that stops the lock ups. If so then you may need an RMA. Let us know.
I actually was running RivaTuner in logging mode. The GPU core was running @ around 56 celcius, and reaching 76c after about 5 minutes under heavy load. The lock ups would generally happen around that time.