Comanche 4 is a helicopter simulation using the DirectX 8.1 graphics interface. It is used to test the memory and 3D subsystems of a motherboard and video processor. Any weaknesses will show up through this intensive benchmark.
Here we see that there are only a few FPS difference. Comanche 4 is another game which is quite limited by processor - just not as severely as Unreal Tournament 2004.
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