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what the difference between 10 bit and 8 bit? noise level
dithering is effecting the lowest bits the bit witch are already all over the place thanks to encoding and again are altered thanks to chroma scaling and YCbCr -> RGB conversation.
so now you go and do RGB dither it to 10 bit and makes the lowest bit more inaccurate give it the GPU that go and convert it to YCbCr down scale it to half the resolution 4:2:0 (yes it has half the resolution of RGB) and hopefully dither it yet again which again adds noise to the lowest bits.
but now the real fun guess what a display has to do to display an image. well it needs RGB guess what it is doing yet again...
RGB 8 bit shines most with TVs that properly support 4:4:4 and on these TVs chroma scaler have a bigger impact on the image.
RGB 8 bit can give you a more refined image while high bit deep can give you less dither noise with madVR and for not properly dithering renderer less banding.
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