I'm using 258.96 for my system.
I have 2 480s in SLI so I'm not exactly what you asked for, but I'm running fullscreen at 1920x1080 with everything on their highest settings with AO and DoF both turned on. I'm getting around 30 FPS in the more crowded areas, more like 40 out in the open.
Edited, Sep 2nd 2010 10:27pm by PLDXavier
FFXI: Astyanax (Bismarck)