Yah, you're video card will declock itself under load if you OC the [CPU] processor. Found that out after 4 weeks of troubleshooting and emailing eVGA. Stupid thing... oh well, now it's been working fine.
Mmmm, Morrowind + 1680x1050 Widescreen + 2xAA, 16xAF + Morrowind Visual Packs + World of Faces = FTW