Windows 10 vs. Ubuntu Radeon Gaming Performance With Linux 4.13 + Mesa 17.2
Shadow of Mordor with low quality settings showed the R9 Fury in particular getting closer to the Windows performance figures. Windows with the R9 Fury was still 25% faster than the latest Linux driver stack.
Upping this game to ultra image quality settings showed the open-source Radeon Linux performance still improving, but the Windows results were around 36% faster.
Total War: WARHAMMER with low quality settings found the Linux driver performance inching much closer to the Windows 10 numbers, even when running this game with its Direct3D 12 renderer.
With ultra image quality settings, the WARHAMMER results on Linux with OpenGL continued getting close to the Windows performance figures with Direct3D.