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 title has been much more NVIDIA-friendly, especially as compared to DiRT 2. The GTX 670 takes a commanding lead here and is exceptionally smooth throughout.