Ubuntu 17.10 Radeon Performance: Stock vs. X-Swat Updates vs. Oibaf PPA vs. Pkppa vs. Padoka PPA
Dota 2 as well can see a few extra frames per second off the Ubuntu PPA options for newer Mesa.
Dawn of War 3 with OpenGL actually is regressed right now for RadeonSI on Mesa 17.4-dev.
The Mad Max performance is mostly unchanged.