You've got an excellent PC and it should run CoD very well. Just a couple of tips: leave "Epilepsy Filter" and "SSAO" unchecked in the video options; the first causes strange colour artifacts and the second slows your framerates for no appreciable benefit.
Some prefer to leave "Vsynch" unchecked as well and instead enable it in the Nvidia Control Panel; either will help if you see distortion (tearing) of the canopy frame when you pan quickly.
I've played with the various settings in the Nvidia Control Panel to get the best combination of performance (fps, no-stuttering smoothness) and image quality. With your PC you should be able to dial in a healthy dose of both.
Good luck!
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My system: i7 920 @ 2.67 MHZ, Win 7 64-bit, 12 Gig DDR3, Gigabyte GTX 680 2 Gig, Thrustmaster Warthog HOTAS, CH Quadrant, CH Pedals, Track IR 5