I have modded the cooler on my 6800 sg with a 120 mm fan that is blowin down on the memory sinks and gpu heatsink. It is now running cooler and I can run at 525 mhz core and 1.25ghz on the memory which is fast enough for me. I am having stability issues when I first start playing a game, It hangs for like 30 seconds after starting the game then plays without artifacts at like 55c after 3 hours of gaming. Would modifying the bios to have a higher voltage fix these problems? How much should I increast the voltage? I'm guessing .05 volts would fix these problems.