DiRT 2
DiRT 2, a lovely-looking racer and one of the first games to use a DX11 path offers improved visuals whilst burning through the London map.
DiRT 2 clearly loves frequency more than memory bandwidth, as the GTX 460 UC 768MB only concedes to a stock-clocked GTX 460 1GB at the highest resolution. The game is very smooth at 1,920x1,080, by the way.