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Radeon Gallium3D Improvements Compared To Legacy Catalyst: Recently I published OpenGL benchmark results on Phoronix showing the open-source R600 Gallium3D driver competing with Catalyst for Radeon HD 5000/6000 series graphics cards. For the Radeon HD 7000 series and newer "GCN" graphics cards that are supported by the different RadeonSI driver, the performance has a ways to improve. What wasn't included with those recent Phoronix articles were looking at the performance for the Radeon HD 4000 series GPUs, which is now only supported by the open-source driver and the Catalyst Legacy driver that doesn't work on modern Linux distributions. Therefore, for this article we're looking at the Catalyst Legacy performance on Ubuntu 12.10 (as well as its open-source R600g driver at the time) and compare it to the OpenGL performance found out of the box on Ubuntu 13.10 and then with the latest Linux 3.12 and Mesa 10.0 driver code.

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