Game Performance 1680x1050
At 1680x1050 we reach a very common level gaming resolution. 256 MB VGA card owners... you'll have to drop AA completely it seems.
At 4x AA we see even a budget card like the Radeon HD 4670 poop out 37 FPS on average. A 100 USD GeForce 9600 GT will push 50 FPS on average. Pretty sweet. BTW look at the 4870 X2 CrossfireX go.