21-Way Open-Source AMD/Intel/NVIDIA GPU Benchmarks On Linux
Until Nouveau re-clocking is sorted out and until the RadeonSI Gallium3D driver is further improved for Radeon HD 7000 series and newer, the sweet spot for those in need of serious Linux gaming performance is with the Radeon HD 6000 "Northern Islands" graphics processors.
Ditto.
The Reaction Quake 3 benchmark tends to always be interesting on the open-source drivers and stress them in different ways compared to the usual ioquake3 games.