ExtremeTech analyzed the performance of graphics cards in Valve's new Team Fortress 2. In this report they focus on 1600 x 1200 and 1920 x 1200 pixel resolutions.
When we think of 3D games this fall that push the graphics envelope, we mostly think of games that strive for a more realistic look like Crysis or Unreal Tournament 3. Valve's multiplayer shooter Team Fortress 2, believe it or not, features some very sophisticated graphics technology. It scales very well to low-end machines, but those with lots of graphics muscle will enjoy better lighting and shaders, motion blur, high dynamic range lighting, and more.
Valve uses the power of modern graphics cards to produce a smooth, cartoonish look in TF2 that doesn't make its sophistication immediately obvious.
Check it out over here. It looks like AMD's graphics cards deliver the best bang per buck in this game.