Currently looking into building a new PC specifically for VR, still torn between Nvidia and AMD GPU, I have been setting up SteamOS purely for gaming since I heard that AMD performs better on Linux based systems.
Is it worth the money and additional heat/power consumption to go with Nvidia or does anyone have AMD and got it to work without stutters? 
I am aiming for a stable 90 fps on VR and 60 fps on flat, currently on AMD Ryzen 7 1700 and Radeon RX Vega 56, most games are limited by CPU according to the performance monitor from SteamVR.
I don't need to have maximum graphical quality, just a stable framerate.