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13-Way AMD GPU Open-Source Linux Driver Comparison On The Source Engine
When starting things easy be attempting to run Counter-Strike: Source at a resolution of 1280 x 1024, all of the graphics cards on the R600 Mesa 10.0 Gallium3D driver were above 30 FPS except for the Radeon HD 4550 and HD 6450 graphics cards. Scratch those off your shopping list right away for an open-source-friendly affordable Linux gaming PC. Besides the HD 4550 and HD 6450, the only other GPU that couldn't do above a 60 FPS average at 1280 x 1024 was the HD 4650 on the open-source driver.
When upping Counter-Strike: Source to a 1920 x 1080 resolution on the open-source AMD Linux GPU driver, it a Radeon HD 4770 or newer is basically needed to deliver above a 60 FPS average. The Radeon HD 5830 and the Radeon HD 6770 and higher were the GPUs on this Catalyst alternative that could drive above a 120 FPS average.