Results: DiRT 3
Codemasters has probably the best looking racing games on the planet. They pulled out all stops with DiRT 3. This particular title features plenty of DX11 effects and tessellation (though I think they took a step back with water effects as compared to DiRT 2). The game used the Ultra preset with 4X AA and 16X AF enabled. The built in Aspen benchmark is used.
This is one game where NVIDIA has a big advantage over AMD. The N580 GTX walks all over the HD 7870, and nips at the heels of the R7970. Only at 2560×1600 do we see the HD 7870 make some ground on its older competitor. At that same resolution the HD 7850 is getting a bit choppy.