DX10 and vista are needed for newer cards/games and full feature support, vista has such a performance hit I wouldn't reccomend it for anyone unless they had plenty of rams and cpu cores to throw at it
DX10 cards will do quite fine with DX9 and windows xp
Crysis is a whole new ball game tho
make sure you have the latest build of dx9c
Edited by DaChew, 06 May 2008 - 09:49 AM.