RadeonSI/RADV Mesa 17.3 + AMDGPU DC vs. NVIDIA 387.12 Linux Gaming Performance

With Mesa 17.3 now having been branched for its stable release next month and that bringing much improved RADV Radeon Vulkan performance and more mature RX Vega support along with a ton of other improvements, here is a fresh comparison of the newest open-source Radeon Linux graphics driver code compared to the latest NVIDIA Linux driver on a range of graphics cards.