Until Re-Clocking Is Figured Out, Nouveau Remains Very Slow Against NVIDIA Linux
Even a GeForce GTX 760 with the Nouveau driver can't run Unigine Tropics above 30 FPS at a sub-1080p resolution.
The GeForce 9800GTX on Nouveau couldn't handle the promising open-source Unvanquished game with the current Mesa 10.3-devel code.
Xonotic even with low image quality settings really isn't playable on Nouveau...