Wouldn't be the first time a driver *gasp* breaks a game!
I already did blame Vista's poor SLI support .
Sorry killer, a driver isnt going to kill SLI performance by 75% by accident, and Vistas poor SLI support *gasp* has nothing to do with it, because, once again, SLI is not supported in the Crysis demo, and *gasp* has been announced by nVidia, and *gasp* is common knowledge around the forums.
Its funny though, i dont even need to think to show your inconsistencies, all i need to do is click a few times and bam, the proof, as they say, is in the pudding, ala the great power of the search engine! Behold!