According to this link, a stock Athlon X4 750K is capable of holding very close to 60 fps in BF4 (minimum is 59), and the 760K is somewhat faster ofc. Based on how close/identically the CPUs rank, BF4 should be GPU bottlenecked on a 760K.http://www.tomshardware.com/reviews/pentium-g3258-overclocking-performance,3849-5.html
I'd think you'd be okay with the 760K. Although, I don't know if that page I linked was single player or multiplayer. Multiplayer is harder for the CPU to run.