Lost Planet (DirectX 10)
Lost Planet is a 1st or 3rd person shooter that was out originally on the Xbox 360 but then made the transition to a DX9/DX10 title for the PC this summer. Set in a frozen world where you have to kill the opposing aliens in order to sustain enough heat to stay alive, Lost Planet has some visually impressive settings that make it a good benchmark title.
There are few DX10 settings that you can enable to adjust for which shader path you would like to use that are only available on Vista when a DX10 card is detected.
Lost Planet on the 8800 GTS 512 does performs beautifully and is able to well out pace the 8800 GTS 640MB card and the 8800 GT.