5-Way Mesa 12.1-dev + Linux 4.7 Git Radeon Comparison

Following the massive Windows 10 vs. Ubuntu 16.04 Graphics Performance With Radeon Software, AMDGPU-PRO, AMDGPU+RadeonSI article, I immediately started work on my next article... In preparation for a hardware launch Linux testing later this month, I started testing my collection of AMD cards on Linux 4.7 and Mesa 12.1-dev. Here are some of those results if you are curious, including performance-per-Watt metrics...