Results: Unigine Heaven
The latest iteration of this benchmark features multiple tessellation levels and some really stunning graphics. Settings were put to maximum for shaders, 2560×1600 resolution, 4X AA, and 16X AF. I tested with tessellation at disabled, moderate, normal, and extreme.
The cards stay tightly bunched at the first three tessellation levels. When it reaches Extreme though, the GTX 670 takes a much larger lead.