NVIDIA 387.34 vs. Linux 4.15 + Mesa 17.4-dev Radeon OpenGL/Vulkan Performance
Metro Last Light Redux is an OpenGL game but the RadeonSI performance here is coming in short of expectations.
Serious Sam 3 BFE with Vulkan shows as well how RADV can be better optimized with the RX Vega 56 losing to the R9 Fury.
With The Talos Principle on Vulkan, the RX Vega 64 only ties with the R9 Fury given the current Mesa 17.4-dev driver state.