Low-End NVIDIA/AMD GPU Comparison On Open-Source Drivers
For the very undemanding OpenArena 0.8.5 game, all tested graphics cards were above 60 FPS when using the low resolution of just 60 FPS.
With OpenArena 0.8.8, the only graphics card of the nine that ran above 60 FPS was the GeForce 9500GT.
For the commercial Prey game, the Radeon HD 6570 turned out to be the fastest graphics card by far while the Nouveau driver was struggling. The only graphics cards above 30 FPS were the Radeon HD 4670, Radeon HD 6570, and GeForce 9500GT.