AMDGPU-PRO 16.50 vs. Mesa 13.1-dev + Linux 4.9 Radeon OpenGL
The performance with BioShock Infinite is about the same between the two driver stacks on the tested AMDGPU-enabled cards.
With Counter-Strike: Global Offensive at 1080p we see the R9 285 is slightly faster with the Mesa driver, around the same speed with the RX 460, and with the higher-end RX 480 / R9 Fury cards there was noticeably better performance with AMDGPU-PRO.
But when running CS:GO at 4K, the AMDGPU-PRO lead diminished for the higher-end cards with now seeing about the same performance on the RX 480 while the R9 Fury was actually faster with Mesa. The R9 285 was also a few frames faster than AMDGPU-PRO in this state. The RX 460 on Mesa was consistently unstable trying to run CS:GO at 4K with the current Mesa Git code.