my screen resolution is 1440x900.
can i run it on ultra setting or not?
If you already have the card, then go herehttp://www.systemrequirementslab.com/cyri
and you could get a rough estimate
heres some one running the game on 1680x1050 which is higher then your res but it gives you an idea.http://www.youtube.com/watch?v=hReNsJmuZVE
He gets about 28avg with your res you may get 30 because i believe the game is locked at 30fps according to the video.
If you take off AA you should get a constant 30 assuming he had it on in the video.
Hope this helped.