just for reference, I run the last nightly build on my rock64 4GB without big problem. I am able to play SD, HD, some 4K and some 4K HDR without problem. And I don't have to disable "allow hardware acceleration-PRIME"
Some weeks ago I had some problem with SD content that was not smooth when playing it, but now everything paly well.
Some of my 4K and 4K HDR do not work but others 4K and 4K HDR work well.