The May 2012 Open-Source Radeon Graphics Showdown
With Nexuiz the Radeon HD 3850 results were rather odd with the Radeon Gallium3D Git code performing at the same speed as the Catalyst driver and the tweaked code running at an even higher frame-rate. However, this was only for this RV670 graphics card and the Radeon HD 4000/5000/6000 series GPUs
The Catalyst driver generally led to twice the frame-rates of the open-source Git-and-tweaked stack.