Well, IIRC, when I last made the rez 1280 x 1024, played the game, exited and then re-checked the d3d9.cfg, I could swear it was back to 1280 x 960. It's not too noticable in game & is unfixable with an ATI card. nVidia users can change the aspect ratio through their GFX control panel.
Best way to test is to change the rez and then load the Training Missions. They load quick and you'll get a good idea about FPS.
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