I'm looking into buying an Asus pg65uq when it's available, but I noticed something strange - it claims to support HDR10 while at the same time only supporting 8bit color. Doesn't those two contradict each other?
An 8-bit display can use FRC to expand its perceived color range. It essentially dithers a pixel between two colors in time rather than with neighboring pixels.
Many monitors do this, in fact a lot of displays that support "16.7 Million Colors" (24-bit Color) are actually 6-bit panels using FRC.
If you are trying to decide between monitors, I wouldn't let this detail become a deciding factor. You are very likely looking at a monitor right now that uses FRC and you may not have noticed. It would be hard for most people to notice the quality improvement of a true 10-bit panel without FRC vs 8-bit with FRC.