20-Way Intel/AMD/NVIDIA GPU Comparison With Ubuntu 14.04 LTS
The AMD Radeon hardware continues to dominate on its open-source driver stack due to the NVIDIA hardware lacking re-clocking support and for many NVIDIA GPUs in my possession the Nouveau driver tends to regress and just ultimately fail (lately with PGRAPH errors and hangs) when using the reverse-engineered driver.
Obviously the non-AMD hardware on the open-source driver is in very bad shape for the Unigine Engine benchmarks.