AMDGPU-PRO 16.40 vs. Linux 4.8 + Mesa 13.1-dev Driver Comparison
The Dota 2 OpenGL performance was about the same speed between the two AMD Linux OpenGL drivers.
With Metro Last Light Redux was running into hangs on the RadeonSI driver Mesa 13.1-dev state while the cards that did work were showing faster performance.
OpenArena is about the same speed between the two drivers and here's also a look at the frame times thanks to the engine exposing it nicely for parsing by the Phoronix Test Suite.