Everything on max settings (Ultra)

Mainmenu:
GPU: ~33% TDP Power, ~31% GPU Usage, ~30% FB
CPU: 1-3% CPU Cycles

In Game VSync Off:
GPU: ~89% TDP Power, ~98% GPU Usage, ~52% FB
CPU: One core at ~100%, a second core at ~60%, the rest ~5%

In Game VSync On:
GPU: ~80% TDP Power, ~70% GPU Usage, ~36% FB
CPU: One core at ~70% with 100% Spikes than and now, a second at ~50%, the rest ~5%


Everything on lowest settings

In Game VSync On:
GPU: ~57% TDP Power, ~50% GPU Usage, ~17% FB
CPU: One core at ~60% with 100% Spikes than and now, a second at ~40%, the rest ~5%

My CPU is a i7-4770k and my GPU is a GTX680

So with VSync enabled everything is fine, as the renderengine is limited to process 60fps (if your monitor is working 60Hz this is) if you've got an 120Hz monitor ... well 120fps get calculated obviously. But as stated above: the engine is most likely not optimized atm.