Hey man, thanks for the informative and in depth post. I am having the exact same problem as you. The difference being that I have an LG 4k tv instead of your samsung. I also tried many different HDMI cables and drivers, today I even decided to wing it and reinstalled windows 10 and still the problem persists so I went and got a replacement adapter from amazon and it still didn’t work. I tried displaying my gaming laptop to my 4k tv to make sure it can run at 4k60fps using the adaptor and it works perfectly. So I think the only conclusion is that our GPUs are the problem in this mess. I hope clud 3d works this out because I would love to use my pc at 4k.