The OpenGL Speed & Perf-Per-Watt From The Radeon HD 2000/3000 Series Through The R9 Fury
That's it for the OpenGL 2.x/3.x benchmarks that could run on all of the tested hardware going back to the Radeon HD 3000 series. However, I also ran some OpenGL 4 Linux games on the newer GPUs capable of doing so. While under the Catalyst driver there is OpenGL 4.x on HD 5000/6000 series graphics cards, that isn't the same level as what's exposed right now by the open-source driver. Only the Radeon HD 5800 and HD 6900 series on the R600 Gallium3D driver expose OpenGL 4.1 right now along with the Radeon HD 7000 series and newer for the RadeonSI Gallium3D driver.
The BioShock Infinite performance was flat from the HD 6950 through the R9 290 and R7 370. However, the R9 285 on the AMDGPU DRM driver (rather than the Radeon DRM kernel driver) was able to deliver better performance. Sadly, the R9 Fury was still struck by a re-clocking issue or other problem when running this Steam Linux game.
Metro Last Light Redux at 2560 x 1600 wasn't really playable on the open-source Radeon driver code. The R9 Fury also continued to have its problem.
Thus, there's not much to look at for the performance-per-Watt in this OGL4 game comparison.