I upped the voltage on my x1900xt to 1.425 on ati tool; after disabling that process that limits the video card to 2d. BUT when i hit default clock on a new profile like u said, it stays at 499/594. Which i dont understand. So i just try manually overclocking since i can actually set the clocks now without it blinking back to default, and at 520 mem clock, i artifact. Maby the msi drivers have a different setup than what your guide suggests. I ran 3dmark05 and scored 10750, which is half ur crossfire so i think its doing fine. But i just wana be able to overclock, but it still wont let me after all that. What do you think?