Haven't been able to measure color accuracy, but this will give you a much better looking HDR picture in windows at the very least on the launch firmware.
1. Go to Menu, Game, & Set Black Equalizer to 18
2. Go to Picture & Set Brightness & Contrast to 100
3. Go to Color & set Gamma to Mode 3
3. Set Windows SDR Content Brightness to 70%
4. Make Sure 10bit Color is Enabled in the Nvidia Control Panel
5. Set Dynamic Range to Full