NVIDIA's Forceware 84.25 is supposed to be the wonder driver for "Oblivion", but we've gotten mixed responses about this driver. It seems good in games, but a little slower in benches. We've done our best with what nVidia gave us. If benches are your thing, then try XTreme-G 84.21.v2. Otherwise you may want to give Xtreme-G 84.25.v2 a whirl.

Also, you can alternatively try the XTreme-G Tweakerizer!

TweaksRUs