Dawn of War 3 released its Linux version earlier this year with support for both OpenGL and Vulkan.  Vulkan performance is much better in CPU bound testing with resolutions under 1080p and when gaming above that resolution it utilizes far less CPU resources than OpenGL.  Overall on NVIDIA performance is the same on both APIs, with the current Radeon driver you are better off on OpenGL.  As is their usual style, Phoronix tested 18 GPUs, a dozen from NVIDIA and six of AMD's cards with differing resolutions and graphics quality settings, all the way up to 4k. 

Check the full results here.

"Today marks the highly anticipated debut of Dawn of War III for Linux (and macOS) ported by Feral Interactive. Here are a number of OpenGL and Vulkan benchmarks of NVIDIA GeForce and AMD Radeon graphics cards running Ubuntu Linux with this game."

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