DiRT 2 - DX9
The lovely-looking racer can use a DX11 path for (slightly) improved visuals. Still looks great via DX9, though.
Benchmarks
Unlike the previous benchmarks, DiRT 2 seems to favour a true CrossFire configuration as opposed to dual-GPUs linked internally on a single PCB. Rightfully so, we reckon, as a pair of cards housed in dedicated PCIe x16 lanes should in theory offer superior performance.
There's little in it when comparing the premium options at DX9, but the more strenuous DX11 test should increase the gaps.