We tested Battlefield 2 with the 1.03 patch and our own custom demo. The demo makes use of multiple vehicles and is very heavy on the GPU. Our tests were performed with all the settings on high and 4xAA enabled.
The good news is that it is almost playable at 1600x1200 with 4xAA enabled. Performance of the stock speed 6800 GS (same as the Evertop out-of-box speed) is much better than that of the X800 GTO without any overclocking or unlocking done to it. This game performs very nicely at 1280x1024 and is more than playable at 1600x1200 without AA enabled.