Hello, I'm using ATITool to overclock a GeForce 7900 GT graphics card. The stock speeds of that GPU are 450 core / 660 memory. By using the max core/mem tests I supposedly found a maximum of 543/858 MHz at about 65º C. In the beginning I aimed for zero artifacts for at least 45 minutes, then lower that maximum by a couple of MHz just to be sure there'd be no problem. To finish, I started the "scan for artifacts" test with the clocks set at 540/850, aiming again for 40 minutes artifact-less. After a couple of seconds I started getting artifacts, so I stopped the test and lowered a bit the clocks. Some time later I get artifacts again, I lower the clocks. Then again, and the same for a while, all the time at 63ºC at most. I checked the log and it says that the artifact found are mostly of 2 pixels and once of 4 pixels. According to the Wiki, 1 pixel artifacts are mostly due to driver optimizations, but what about these ones? Should I keep lowering the clocks until there's no artifacts or could I ignore these ones safely?