Comment No.. they really haven't (Score 3, Informative) 136
All that was shown here is that AMD's *OpenGL* drivers on Linux aren't too far off from AMD's *OpenGL* performance on Windows.
Considering that AMD's OpenGL Implementation on Windows is kind of a joke compared to D3D, and considering that AMD is now even dumping D3D in favor of its proprietary* Mantle platform, this article basically proved that AMD's Windows OpenGL support is also lacking badly.
* Before anyone says Mantle is "open": AMD's executives promised an SDK published by the end of 2014... didn't happen. AMD has made zero efforts to make Mantle work on any OS other than Windows... hell, while DX11 ain't an open standard at least I can go online and get docs on how to write a program using DX11 and make it work on Windows... you can't even do that with Mantle!