I just installed my 7900GTO. I used driver cleaner to remove my ATI files then put in the card and installed the drivers from the CD it came with. Ran the CS:S stress test and the results were not as high as the should have been. So I went into ATI tool and the 3d clock settings for the card were set much lower than stock. So I bumped all of the speeds up to stock speeds for a 7900GTO and the cable that I had connected to the six pin connector in the video card fried almost instantly. Luckily nothing else on my PC was damaged. So I took one of the 4 pin to 6 pin converters that comes with the card and plugged in a different cable and everything started correctly. Except now I get the message from windows that tell me because of a hardware change I need to reactivate windows which I shouldn't have to with a new video install. Also I am kind of scared to bump the clocks up on the 7900GTO again fearing that something may be wrong with my powersupply and that the cord failing may have saved me from a fried card. Any help and insight into both of these problems is much appreciated.