i bought an Abit X800Pro and did that very mod. got it to an XTPE no prob whatsoever. only thing is, it can't do PE speeds, so i had to downclock the core but overclocked the memory. i figure it's about spot on because of it. 25286 3dmark01se, 12445 3dmark03, and 5740 3dmark05
i love it