By now you should have heard about the Linux version of Valve's Source Engine which allows you to play any of the games based on that engine on the open source OS.  Phoronix has just completed a battery of tests showing the performance of both AMD and NVIDIA GPUs in these games as a prelude to what you can probably expect from the Steam Machine.  AMD's older cards performed at a higher level than did NVIDIA's legacy GPUs as well as taking top spot overall with the HD 6870.  Check out both reviews to see how your silicon will handle TF2, CS:Source and other favourites.

"For your viewing pleasure today is a 13-way AMD Radeon graphics card comparison when testing out the open-source Radeon Gallium3D drivers on the wide spectrum of ATI/AMD GPUs while looking at the performance for Valve's Source Engine with Counter-Strike: Source and Team Fortress 2. Given the imminent arrival of Steam Machines and SteamOS to push Linux gaming into its long-awaited spotlight, is AMD's open-source Linux graphics driver capable of delivering a reasonable level of performance?"

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