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 has been something of a poster child for multi-GPU scaling. Run in DX11 mode and the strapping of two cards together provides a meaningful boost to numbers at the highest resolution. NVIDIA's SLI implementation seems more robust that AMD's CrossFire in this title, where two GTS 450s combine to add an extra 86 per cent performance. Nice, nice.