So that's interesting. I upgraded to Minecraft 1.3.2 and even with a bunch of mods it's running great even with every setting available cranked up and modded 64x sphax. I'd guess that it was a threading issue of some sort, but that's weird since 1.2.5 worked great before my hiatus and driver upgrade. Oh well, not sure why I'd expect something in the minecraft engine to make sense Sorely missing RedPower, but getting along without it. Thanks again for trying, blob face.