Hey guys i just finished playing stalker CS and i can tell you that
4870 x2 scales very well at 1920 x 1200
I was gettin an average of 45 fps with maximum fps in the high 70s and minimum in the low 30s.
I had everything maxed out with dx 10 lightning, maximum AF and AA. I actually
set the detail on maximum and then i went it and placed the vision distance, object detail, AA and AF all the way to the right, lol
My only complaint ( besided the fact that the game is very buggy) is that
sometimes when u start in the clear sky base my frames would drop in the high 10s for some reason that i dont know (prolly power play is acting funny), but as soon as i was gettin out of the clear sky base, the game would stay in the 40s range.
I will post some screenshots taken with fraps to back my statement if u guys want.
But for any of you in doubt about scaling in stalker with a 4870 x2, rest assured that the card will give good fps, at least up to 1920 x 1200 - which is what im using.
The card that i have is a sapphire 4870 x2 at stock speeds, and a q9550 at 3.4ghz