Hi, I recently tried to overclock my MSI 6600GT PCI-E card and its not very stable at 550/1.14. I keep getting artifacts. I used coolbits and just did detect optimal settings which put it at 568/1.14. I then had to keep backing it down to get it somewhat stable. But when I play for a while I get artifacts and what not. Its not hooked up to the PSU right now, I couldn't find a connector on it?? Maybe thats the problem I don't know. I have a decent case cooling system (2 'normal' case fans and 2 Vantec Tornado fans capable of 5400 RPM). Any ideas?