Currently, I have a GTX 770 graphics card and a i5 4670k cpu. When I play a game like over watch, my GPU load is 99%. Does this mean it is "bottlenecked"? Also, I'm considering upgrading to a GTX 1070 and keeping the i5 4670k, would this set up be enough to run big games such as battlefield 1? Or is upgrading the CPU necessary as well to run a game like that?