The i72600 is a plenty capable cpu. I mean sure his is newer so it's got like a 10-15% performance increase, and can overclock. But in battlefield it shouldn't make much of a frame rate difference. You've got a slightly faster graphics card so naturally you should get 5-10 frames more
So I'd say it's not bottlenecking. I'd try installing the latest gpu drivers and seeing if that makes a difference.