[Nom1fan]

This is not correct...
With my GT1030 and Kodi DSPlayer Version with madVR I can play all 4K HDR (23,976 fps) files without ANY problems.

Edit: Ok, by reading the whole thread I noticed this was already said. If anyone need further info / testing with GT1030 (i3 2110, 4gb Ram, Windows 10 x64) with latest nightlies, give me a feedback
I have a 4K HDR Samsung Screen, so I can test HDR movies
Actually I have latest Kodi 18 Alpha as my standard Media Center and for watching 4K HDR content I use Kodi 17.6 DSPlayer (because Kodi 18 cant passthrough HDR metadata)   

From what I understand ( as has been said here earlier ) the opposite is correct. Kodi 17.6 does NOT support HDR, and kodi 18 Alpha does.   

This is more or less correct, but just half of the truth.
Kodie 18 Alpha do not really support HDR on Windows, because Kodi 18 Alpha do not switch automatically to HDR mode in Windows when playing a HDR-movie.
Kodi 17 as it is does NOT support HDR, but I didnt said it would

I said, that Kodi 17 DSPlayer Version (Klick) with madVR support HDR with automatically switching to HDR mode in Windows...  

 Ok got ya, sorry for my misunderstanding.
Quick question, when u play HDR content in DSPlayer with madVR, does the HDR icon show on your TV?
I'm asking since I tried it, and after going through the huge guide you put a link to and spending hours in configuration, HDR playback was stuttered and unwatchable, and I also never saw any HDR icon on my TV.