Specs: Asus A8n32-SLI Deluxe Motherboard AMD Athlon FX-55 processor OCZ4001024ELTE RAM Dual-Channel 400Mhz - 3 1 Gig sticks 2x7900 GTX in SLI (SLI is not enabled) Creative Audigy 4 Lately whenever I run games on my Primary Video card anywhere from 30 sec. to several minutes the screen will flash black and then shortly after the frames will drop significantly with the occasional black screen flash. I've used Gpu-z and Rivatuner to determine that at the first black screen flash the Core clock speed has dropped from 675mhz to 630mhz. At the major frame rate drop the core clock drops to 275, normally the idling speed. As far as I can tell the temperature has nothing to do with it as it has done it while the temp was anywhere from 65 to 74 degrees. The amount of time it takes varies, but older and less taxing games seem to take longer for the drop to occur. Nothing on my computer is overclocked it's all at stock speeds and timings. The secondary card seems to run games without any problems. I tried a variety of drivers, none of which seemed to make much of a difference. The only other thing I could think of was that I had installed Gears of War right before this happened. I uninstalled the K8 processor driver that it came with and installed the newest driver from AMD's website, but that didn't seem to help. I haven't tried actually uninstalling GoW yet. But I am very tempted to redo my computer to see if it is a software problem. Does anyone have any ideas as to what it could be before I go to such drastic measures?