bf4 @1080p ultra 35-43fps
c3 @ 1080p high 59fps
bf4 @ 1080p ultra 42-54fps
c3 @1080p high 71fps
in general look here http://www.anandtech.com/bench/product/1038?vs=1037
its a fairly significant difference if you intend to run games like bf4 at maximum settings. the 760 is fine for medium or possibly high while the 770 can handle ultra. at 1080p of course. if running above 1080p your figures will be different.