Ive done a Driver Cleaner like 10 times for all nvidia involved. When i had the original stock heat sink with the 6800, it just happens when im in games, doesn't happen when im in desktop mode. I used SpeedFan to check my readings, and it got passed 50-60 degrees when playing games like (CoD2 and HoMM5). I thought it couldve been the heat being distributed, so i got the NV5 Silencer Rev 3, and it made the side of the card (the metal bit, quite hot), i dont know why i followed the instructions listed in the manual. Removed the stock heat sink and basically installed the Silencer, wasn't hard at all.
But when i tried starting up my computer, it would just get artifacts in the start up screen, then made my computer crash. I don't know what the problem is, as people have said it could probably be the memory clock, unfortunately.. since i took off the stock heat sink, my warranty is void

. obviously my PSU is wayyy to low, which may have cause my graphics card to crash badly. So do u think it'll make much of a difference (getting rid of artifacts) if i get a better PSU with the Rev5? Or just wait till i get a new mobo with PCI-E and wait for DX10 to be released, hopefully not long..