Well, I guess I'm stuck with 12 pipes. I tried several different bios flashes, including ATI's X800 Pro Vivo w/16 pipes bios. I can do nothing it seems to get rid of the artifacts when I have 16 pipes. The extra pipes on this card must be bad. So I'm back to my original bios w/12 pipes and OC'd it to the 520/560 XTPE settings. Everything is running fine and I get a 3DMark of 11566... not to bad, but I sure would have liked the 16 pipes. If anyone can think of anything else I could try, please let me know.