Should Dithering be enabled, if the monitor is 8Bit+FRC?

[MathiasFH]

So, I have a 10 Bit monitor (really 8Bit + FRC) with 10 Bit enabled in the Nvidia control panel. But this tool obviously is a little bit independent of the control panel. So if I use a target EDID colour gamut (btw. "clamping" to AdobeRGB gets rid of typical wide gamut issues for me, without other limitations), should I also enable Dithering then? Because the Default State is effectively called "Disabled" in the overview.

[hadoooooouken]

Dithering is designed to eliminate color banding. It is noticeable in 8-bit mode.
With 10-bit mode enabled (even with "fake" 8-bit + FRC) you don't need it.

P.S. If you want to see the difference in action:

1. Set display mode to 8bit
2. Disable any dithering
3. Select Gradients test with 256 steps https://www.eizo.be/monitor-test/ - you can see a non-smooth change in color.
4. Now enable dithering or change to 10bit.

My monitor allows 10 bits only at 120Hz. At 165Hz only 8 bits - for this mode I enable dithering.

[Globefishp]

I've try with 8bitFRC monitor 32UQ850V, using DisplayCAL + i1d3, It turns out:
No dithering: 10 bit effective Video LUT depth.
Dither to 10bit (SpatialStatic): 12 bit effective depth.
The method of dithering would not affect the result of measurement.
About dithering method you can read https://hub.displaycal.net/forums/topic/how-to-enable-dithering-on-nvidia-geforce-with-windows-os/
But noted that if you let windows to handle color management (not using Profile Loader comes with DisplayCAL, or even using the profile loader, after a plug/unplug of a monitor or windows sleep, see https://hub.displaycal.net/forums/topic/the-complicacy-of-bit-depth-mismatch-with-nvidia-rtx-and-10-bit-panel/ for more info), the effective VideoLUT will be only 8bit regardless of dithering or not. I'm using Windows 10 22H2.