The YCrBr color space is NOT the same as RGB 0-255, and you do NOT want to use it instead! If your monitor is expecting RGB 0-255, and you give it either RGB 15-235 or YCrBr, you will get massive color distortion. In the case of YCrBr, you will lose all detail in shadows!
Is my monitor expecting RGB? Who says? Did you produce my monitor panel? What if my monitor is actually expecting this? http://en.wikipedia.org/wiki/XvYCC
You've given me nothing to go on here except 'NO, DON'T DO THAT.'
Would you like me to take several hours to explain different color spaces to you? If you don't want it fixed, or you're not affected by this issue, then ignore it. Tell me what your monitor's model number is, and I'll Google it and find out what color space it needs for you, if you'd like.
If your monitor is expecting that, and you have it hooked up with HDMI, and it's a "TV resolution", you're only getting a fraction of the colors its expecting, and you will get horrible artifacting.
It doesn't matter if your monitor can display the Rec.2020 color space. If you give it the wrong signal, it will not be giving you the right colors!
I have given you plenty to go on, if you read the first post, and go to the link. An Nvidia moderator is the guy who describes the fix in the link, and that's what I followed.