I think you would be fine with a new graphics card, for the moment COD doesn't stutter for people with graphicscards with 2gb RAM, so I would recommend a Radeon HD6970 card with 2gb ram for now. I'm using a 5870 in my mac pro and i get around 40-50 fps if I didn't have the stutter (it has only 1gb of ram).
Good luck!
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