face the fact: if you want usefully running DX10 feature support, get an X360 or a PS3
Ain't the 360 DX9 and the PS3 OpenGL though?
And regarding STALKER, yeah, that game is a bit of a mess regarding a fair amount of systems, and its crapload of bugs and lack-of-optimization.
(heck, had to stop playing the game since I hit a game-stopping bug on my setup, been waiting on the 1.04 patch for 2 months now)