Crysis is probably the de facto benchmark game since almost no currently available card can offer acceptable frame rates at high resolutions and with very high quality settings enabled.

However, the game is full playable at 1280x1024 even with with high quality settings enabled. The Inno3D GTX275 OC was very fast at this resolution and gave an average FPS of 50.00, leaving the GTX260 cards behind:

Enabling the very high quality settings has an significant impact on the performance of all the graphics cards. The Inno3D GTX275 OC gave 23 FPS, while the GTX285 solutions show their teeth with 32FPS:

Pushing resolutions even higher at 1680x1050 and 19200x1200, the performance difference between the GTX285 and GTX275 series is around six (6) FPS.