ya thats true you need it to be compatible
and where did you hear that?
It's been out for a while. A bunch of guys got Crysis running at DirectX 10 on XP. There a file you can download that enables it for any game.
http://www.techmixer.com/download-directx-10-for-windows-xp/
I loved DirectX 10. It's absolutely stunning. It was the only reason I moved towards Vista.
Comparisons.
http://www.winmatrix.com/forums/index.php?showtopic=9550