Graphics processors will often run at 100% despite there being a bottleneck. There are subtle ways to see what is bottlenecking performance in a game, but you'd have to know exactly what to look for. From experience with what hardware I've used, reviewed, and read about in the past, I would say those 2 pieces of hardware are about even. Still, that cpu can overclock quite a lot, and you would do well to take advantage of that.