I played the beta last night - and with my rig below (graphics HD 6950) at a resolution of 1920x1080 I managed an average of 33 fps on high settings. The lowest it went was 24 fps.
I don't imagine that your graphics card will be able to do high settings, maybe a mix of both medium and high, but probably just medium. Even so the game will look stunning. And it plays well too.