Yes the latest 1803 version of Windows (aka April update) allows RGB 8bit + FRC. This allows hdr devices with hdmi 2.0 ports like the gtx 980ti or TV's/monitors with only 2.0 hdmi port to process a HDR signal whilst using full RGB. Previous to this release I could also only output HDR at 10/12 bit deep colour at ycbcr 422, limited @ 60hz and 1440p resolution. But now Windows allows me to activate HDR at RGB 8bit Full @ 120hz. My HDR monitor isn't a true 10bit panel anyway but 8bit +FRC. The colours are a lot richer at RGB full than ycbcr limited and my 980ti can output HDR at a much higher refresh rate of 120hz rather than 60hz. I'm currently playing Assassin's Creed Origins at 1440p on very high graphics settings (resolution modifier on 80%). NVCP set with adaptive vsync @ half refresh rate. Render frames ahead set at 2, and triple buffering on. I have vsync on and frame limit set at 60fps in game. My display puts out a cleaner image at 120hz than it does at 60hz .But as my machine isn't capable of 120fps in this game, using adaptive vsync at half refresh rate allows me to get an almost constant and tear free 60fps. I feel that HDR now works properly. Not sure if this driver is also necessary to use 8bit HDR (with dithering) on the 1803 preview build of Windows. But the Windows 10 April update will be available for general release on Windows update soon. And for owners of HDR displays, I think it's a must have. 397.31 seems solid and gives smooth frame rates but not as fast as 388.59 for me. But not sure if 388.59 works so well in HDR with new windows update and don't see any reason to roll back at the moment.