P-State/CPUFreq Governor Tests With Linux 4.12 For OpenGL/Vulkan Games
The Talos Principle didn't see much of a change in performance with either Vulkan or OpenGL.
Deus Ex: Mankind Divided only saw a drop in performance when using CPUFreq Ondemand for this Skylake system.
DiRT Rally saw similar performance between P-State's powersave and performance governors.