^ok, maybe the new driver has lower performance for 3dmark06. Just ran unigine heaven benchmark 3 at 1600x900, tessellation: extreme, shaders high, no AA and got 19.1 fps / score 480. Temps: GPU 74, CPU: 85.
Unigine heaven 3, same settings, with an overclock of +100/+100 for core/memory: 21.3...