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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation (www.gamingonlinux.com)
submitted 2 years ago by to c/technology@lemmy.world
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[–] 1 point 2 years ago (5 children)

That doesn't even seem so unreasonable. Is that the limit though? My cable puts a gigabyte a second down it so I wouldn't imagine that would hit the limit.

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  • [–] 2 points 2 years ago (3 children)

    It is trivial arithmetic: 4.52403840*2160 ≈ 9 GB/ s. Not even close. Even worse, that cable will struggle to get ordinary 60hz 4k delivered.

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  • [–] 3 points 2 years ago*

    4.5 × 240 × 3840 × 2160 ≈ 9 GB/s

    It seems markdown formatting ruined your numbers because of the asterisks. Whatever is written between two of those turns italic, so they're not ideal for multiplication symbols here on Lemmy (or any other place that implements markdown formatting).

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  • [–] 2 points 2 years ago

    USB-C with Thunderbolt currently had a limit of 40Gbit/sec. Wikipedia has a table of what DisplayPort can do at that bandwidth:

    https://en.wikipedia.org/wiki/DisplayPort

    See the section "Resolution and refresh frequency limits". The table there shows it'd be able to do 4k/144hz/10bpp just fine, but can't keep above 60hz for 8k.

    Its an uncompressed video signal, and that takes a lot of bandwidth. Though there is a simple lossless compression mode.

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