Wow, you named pretty much all the utilities there. I've never heard of an artifact tester, if that's an ATi thing then it explains it, my last ATi card was a Radeon 7K. Basically, use rivatuner to unlock, before that, use coolbits to OC, then just run some new 3dmark and look for artifacts. Discolored things, textures only half showing or not showing at all, snow, shimmers. My card is kind of wierd, if its locked, everything looks fine, but if its unlocked, everything expect some certain textures in the game which usually turn out to be the ground have a slight rip through them that shimmers off and on. I guess I have one damaged pipe, I probably made it sound worse than it is because I hadn't noticed until about a week after I unlocked the card. Just look for artifacts yourself.