While Crysis was considered a brutal test for the past generation of GPUs, the torture test for the current generation is Metro 2033. With the eye candy turned up to the max, Metro 2033 isn't quite playable on the Double Black Diamond 7870. It's the fastest video card on the charts, but the minimum framerate is still well below 30fps.
Dropping the quality settings from Very High to High and the anti-aliasing method from MSAA to AAA makes Metro 2033 playable.
DiRT 3 uses the EGO game engine, which was developed by Codemasters. Other than the DiRT series, it's also used by the popular F1 racing series games (also by Codemasters). It uses DirectX 11, and the same game engine will be used for the upcoming DiRT and F1 games due to be released late this year. The Double Black Diamond 7870 manages to be a little faster than the FeForce GTX 580.