[Warner306]

I don't have an AMD GPU, but that is the last I've heard on HDR playback. When AMD HDR support was added, madshi said madVR must output in 10-bits for it to engage HDR mode (so you also have to use a D3D11 presentation path, as well). This is not a problem with Nvidia.

Hi, yes that is correct, you have to have 10bit enabled in MADVR and use DIRECT3D11 ticked in MADVR, however you can still run your desktop in 8 bit 444bit and it will autoswitch no probs.  

 Didn't know that. The only problem is the GPU is downconverting the output from madVR to 8-bits. So this is not ideal. If you are outputting from madVR at 10-bits, you would want to match this at the GPU or the GPU will undo the work done by madVR. If it is just the desktop we are talking about, then there is no issue.