The beauty of this game is it will run on almost anything but on a mid-level, reasonably priced card it will run beautifully.
I'm now running an Nvidia 6600 GT with 256 DDRIII and the graphics are something to behold even with that card.
If you have any trouble with lag in game check your graphic options. I can run my graphics at max while standing still taking a screenshot but while actually playing the game i turn down the quality and turn anti-aliasing off in order to maximise speed and improve my ability to play roles that involve reaction times.
How have you gone with your graphics issue? if you have any trouble post here, we'll be happy to help.
__________________
|