Open-Source Nouveau Linux 4.10 + NvBoost vs. NVIDIA Proprietary Linux Driver Performance
Tesseract is another lighter game and as such its performance of Nouveau relative to the proprietary driver is much closer with the GTX 680 here hitting 74%.
With Team Fortress 2 that's rather CPU-bound with modern GPUs, the GTX 780 Ti could deliver effectively the same performance with Nouveau as it did with the binary driver! But for the GTX 680 it was at 83% but still very much playable.
The Xonotic results for the Kepler GPUs with the Nouveau vs. NVIDIA drivers remain quite good too.