Crytek Recommends Upgrading To Vista ASAP » DigitalBattle:

Crytek boss Cevat Yerli spoke to FiringSquad about, you guessed right, Crysis. They talk about the technical aspect of the game, graphics, AI, phyics, and of course, DirectX 10. Yerli pointed out that DX10 not only generates better particle effects and visual quality, it also runs faster than DX9. He mentioned that while it didn’t add anything in particular concerning gameplay, it could add an advantage to DX10 users in the PvP multiplayer part of the game.

and we say…NOOOOO!