Ok I'm all up to date now, but still not happy with the look of hdr in windows. I feel that nvidia full rgb 8 bit with no hdr looks better than ycbcr limited 10 bit with hdr. Guess I have to experiment with more settings.
I recently got my 1st 4k display and it is hdr capable. It's a Vizio E43 F1 43" supporting hdr10. I have an old installation of win 10 pro, almost 2 years old, but up to date. My tv settings are all correct and I can confirm hdr has worked based on the tv's own info screen and with hdr...