Should play great just your graphics card. But this is what i read. "graphics performance is powered by CPU integrated Intel graphics?"
You should upgrade a card. I recomend the gtx 460. I have a 250 and its the same power supply requirement -450-. Your Cpu is perfect. Gtx 460 is a newer card by Nvidia. But you should be able to play max settings. I have a Intel core 2 duo 8400 3.0, Gts 250, 3 gigs of ram. And i can play Max on Cod 4 Mw1