Running Gears3 from Minigl Demos results in 100% cpu use.
Running Warp3D Nova Gears results in 12% cpu use .
Idle system is 5 % cpu use.
Sam460ex RadeonHD 7750
Be careful what you compare here, the Warp3d Nova demos are locked to the screen refresh rate.
On my system (x1k) the Nova gears example barely gets out of the 'rest CPU noise' (as displayed in CPUInfo docky) , at the default window size, though CPU usage does go up as the window size increases.
These aren't demos but coding examples. Please don't attempt to use them for crude benchmarking. The results would be less than meaningful.