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.
Gone are the days where AMD dominated the DiRT track. Even though DiRT 3 is an AMD Gaming Evolved title, the NVIDIA cards are king here. The HD 6970 is below the GTX 570 and is only slightly ahead of the GTX560.