gtx 960 only at 30% usage?

Jan 10, 2015
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when i play league of legends-minecraft my GPU usage is at 30-50% but i get more than 60 fps why is that? this only happens on old or not demanding games when i paly witcher 3 or ac unity my cpu is at 60-70% and the gpu at 99% why is that? i always deactivate vsync and i have a gtx 960 i dont think there is a bottleneck