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How do you enable 8-bit HDR when operating at 4K @ 60Hz @ 4:4:4? By connecting my TV to my PC, I...

How do you enable 8-bit HDR when operating at 4K @ 60Hz @ 4:4:4? By connecting my TV to my PC, I can either do 4K @ 60Hz @ 4:4:4 without HDR or I can do 4K @ 60Hz @ 4:2:2 with up to 12-bit HDR. Is this just the current limitation we have with HDMI 2.0? I assume that it is better to be at 4:4:4 than it is to lower my display to 4:2:2? Also is game mode the best option for consoles or is it necessary to set them as PC sources so that they can benefit from 4:4:4?
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    This is a bandwidth limitation of HDMI 2.0. Chroma 4:4:4 is generally recommended for PC use, as it helps the text appear clearer. For console gaming, most people won't even see a difference with 4:2:2 unless you are playing a very text-heavy game or using your console to browse the web. You can learn more about Chroma Subsampling here. Game mode is generally the best setting for console gaming, as it will disable most of the TV's post-processing to reduce input lag.

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