Most GPUs from GTX 1060 up support HDMI 2.0.
However, this is not as simple as it sounds if you want to play 4K optical disks. 4K will require Software Guard Extensions (SGX) support, which you can only get from a motherboard that support Kaby lake CPU or later, and has iGPU with Intel Graphics 630 or higher. The motherboard must support AACS 2.0, and HDCP 2.2 as well.
However, one of these motherboards may do the trick.
https://www.gigabyte.com/Motherbord/Z370N-WIFI-rev-10#kf
https://www.asrock.com/mb/Intel/Fatal1ty%20Z370%20Gaming-ITXac/#Specification
Edit... Ooops... I just remembered you are looking for an AMD board.... I haven't seen one yet, but AMD does not support SGX and IIRC, doesn't have a compatible equivalent at this stage.
If you have a 4K (2160p) media file it's a bit easier. A recent graphics card and a 4K monitor/TV and a software player like PotPlayer will usually do the job. Of course, 4K rips are often of questionable origin, unless you are ripping from your own original 4K discs.
If you want HDR that's another can of worms. Windows 10's support for HDR isn't very mature and may actually make the picture look worse.
Rather than repeat what's been said on many places before, here's a link that discusses playback with optical discs. https://www.neogaf.com/threads/heres-what-you-need-to-run-a-uhd-blu-ray-movie-on-your-pc.1359619/
hth