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I'm slightly skeptical of their benchmarks -- the fact they're using 300fps numbers is a red flag. No one runs games at that speed. What's the comparison for a game running at 30 - 60fps? My hunch is that D3D has a tiny fixed per-frame cost that becomes irrelevant when frames take 10x longer to render.

when you turn on vsync, the frame rate is at most 60. When you turn it off, you certainly can have 300fps.

Sorry, my point was that they picked a benchmark that was too easy. I suspect if the machine was straining to hit 60fps their results could be vastly different. That's how most games run, so that'd be more interesting to see.

I think the point is that benchmarking the graphics subsystem's throughput is easiest when you look at high framerate games; otherwise CPU or just rendering time might be the dominating factor.

That would change the size of the effect, but OpenGL would still be faster. Also, 60fps x 5 = 300, so 1/5th of 20% ~= 4% faster which is still significant for them.