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12-bit YCbCr 4:2:2 is all that is available for Blu-ray players as part of the HDMI 2.0 spec at 60 Hz. There is no 10-bit YCbCr 4:2:2. So the UHD format was designed for 12-bit output. I doubt 10-bits would make much of a difference unless the GPU is doing a poor conversion. Current UHD displays are supposed to be designed for 12-bit YCbCr 4:2:2.
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