I run RoF , CoD black ops , Crysis all maxed settings and have excellent FPS , CoD runs quite well on medium to high settings and I'm sure my video card and the lack of optimisation of the game is the only reason I can't max it too.
I think a whole lot of us have extreme overkill on our processors these days and
CoD has barely used the cores we have.
So you should be fine either way
sg