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I bought an Asus PG32UQ monitor recently and connect it using a mini DP (eDP 1.4) with my HP ZBook Fury 15.6 Inch G8. And to my surprise, I can run at 4K on 144Hz with HDR enabled.

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This is a bit confusing to me, because according to Wikipedia, only 98 Hz should be possible (or 120 without HDR) (source). So where is the trick? Is it because of chroma subsampling?

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  • It seems to me that this just indicates that your rig supports Ultra High Bit Rate.
    – harrymc
    Commented Jun 10, 2022 at 11:18

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Basic calculation:

30 bits => 4 bytes (32 bits) per color channel.
3 color channels (RGB! ?)
3840 by 2140 pixels, of 3x4 bytes each
... at 144Hz

=> 3840 * 2140 * 3 * 4 * 144 => 14200012800 bytes per second
RAW 13542.1875 MiB/s to transfer through your cable.

This might differ from the actual transfer speed in your cable, due to various "tricks" being in use (e.g. compression!).

Practical requirement: It should be possible to check if computer display hardware, cable and monitor all are capable of the above.

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