Doom seemed to bring out artifacts in my 9800p at lower speeds than other games. You may just have a lousy chip. I'm going to assume it runs fine in doom under stock speeds. Is it a 350 or 360 core? If the latter, what are your temps?
Try reseating your card in the agp slot and or the VGA silencer and/or swap PSU's.
Don't trust MBM for voltages.
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