We ran a timedemo on Quake 4 at 1600×1200 with 4xAA.

quake NVIDIA Forceware Vista Beta Drivers Preview

Readers should have noticed the blank on the bar corresponding to 173.61 drivers. With this particular beta driver, Quake 4 refused to operate at all. Upon entering 3D, the display would blank. A 0.3FPS difference in OpenGL 2.0 performance is of no worry. The finalised drivers should do better.