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Valve has reported better performance in Linux than in Windows 7 for at least one of their titles [1].

[1] http://www.zdnet.com/valve-linux-runs-our-games-faster-than-...

Depending greatly on your hardware. And there's the rub. And there's the reason it could be really nice to have Steam boxes and certification of hardware for SteamOS

I think they mean in comparison to Windows. They have previously reported getting better performance using OpenGL on Linux than DirectX on Windows[1]

1: http://blogs.valvesoftware.com/linux/faster-zombies/

Nvidia Linux drivers are very good, and are at feature parity with Windows drivers.

And in general, OpenGL is quicker than DirectX...