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The Samsung G9 is only capable of achieving 240Hz with display stream compression (DSC). Source: https://www.rtings.com/monitor/reviews/samsung/odyssey-g9 https

The Samsung G9 is only capable of achieving 240Hz with display stream compression (DSC). Source: https://www.rtings.com/monitor/reviews/samsung/odyssey-g9 https://www.rtings.com/monitor/reviews/samsung/odyssey-g9.

cehrlich 5y ago
Apple's $5000+ Pro Display XDR uses DSC when you plug stuff into the rear USB ports, so I think it would be fine to use it on the Studio Display also.
- brigade 5y ago
  Even without anything plugged in, or any other displays downstream of the host thunderbolt port, XDR will preferentially negotiate one HBR2+DSC stream if the host supports it. (17.28gbps) Which yes, means that a hypothetical 6k120 could be done at the same compression level as current 6k60 by using both HBR2 streams that a Thunderbolt 4 host port is required to support.
  - radicality 5y ago
    Hey, would you have some details/info on how I can figure out what exactly my XDR is ‘doing’ (find its connection type like you explained, and pixel depth that the graphics card is outputting - 8 bit vs 10 bit). I have the M1 Max 14”, and also bought the XDR around a month ago for the extra 6k screen real estate. One thing I noticed is that I can’t figure out what pixel depth it’s running at on my M1 (intel shows 30 bit framebuffer in System Report, M1 shows nothing). SwitchResX software is reporting that it’s running in “Millions of Colors” (8 bit), but I’m not sure if that’s true. The same setup is reporting Billions of Colors on an intel MacBook. It overall seems to be there’s things missing for the XDR <-> M1 interactions :S
liquidise 5y ago
DSC was arguably the hallmark change of DisplayPort 1.4[1]. To say something is "only capable of achieving" its performance by utilizing the very tech it is built on feels like there has been a misunderstanding somewhere. To be clear, Display Stream Compression is different from Chroma Subsampling[2], which the parent referenced. 1. https://en.wikipedia.org/wiki/DisplayPort#1.4 https://en.wikipedia.org/wiki/DisplayPort#1.4 2. https://en.wikipedia.org/wiki/Chroma_subsampling https://en.wikipedia.org/wiki/Chroma_subsampling
- KolenCh 5y ago
  “Only capable of achieving” is likely referring to it being lossy. It is reasonable for some consumers or manufacturers to not settled with lossy.
  - lsaferite 5y ago
    FWIW, DSC is claimed to be lossless. https://www.cablematters.com/blog/DisplayPort/what-is-display-stream-compression https://www.cablematters.com/blog/DisplayPort/what-is-displa...
    - wtallis 5y ago
      "Visually lossless" isn't really lossless. What it actually means is "we're pretty sure you won't notice", which is probably correct but isn't a claim that should be accepted at face value.
      - lsaferite 5y ago
        Which is precisely why I included the "claimed" part in my statement. I don't know enough about how the compression works to know one way or the other definitively.
      - account42 5y ago
        To put it another way, there is no such thing as general lossless compression - to make some data smaller without losing any information your new representation has to make other data larger. You can limit that "larger" to 1 bit but you will still have some cases where the compressed data is definitly not smaller than the source so it will not help you with cases like this where there is a hard upper limit on how much data you can transport.
      - fomine3 5y ago
        VESA/display manufacturers should provide various DSC examples for consumer, rather than just saying "virtually lossless".
    - 5y ago
eek2121 5y ago
As a G9 owner, I'll say it can't even achieve 240hz with DSC. Look up all the G9 owners who have 3090s (or other cards) and experience interlaced output when the refresh is set to 240hz on their G9s, including me.

cehrlich 5y ago

Apple's $5000+ Pro Display XDR uses DSC when you plug stuff into the rear USB ports, so I think it would be fine to use it on the Studio Display also.

brigade 5y ago
Even without anything plugged in, or any other displays downstream of the host thunderbolt port, XDR will preferentially negotiate one HBR2+DSC stream if the host supports it. (17.28gbps) Which yes, means that a hypothetical 6k120 could be done at the same compression level as current 6k60 by using both HBR2 streams that a Thunderbolt 4 host port is required to support.
- radicality 5y ago
  Hey, would you have some details/info on how I can figure out what exactly my XDR is ‘doing’ (find its connection type like you explained, and pixel depth that the graphics card is outputting - 8 bit vs 10 bit). I have the M1 Max 14”, and also bought the XDR around a month ago for the extra 6k screen real estate. One thing I noticed is that I can’t figure out what pixel depth it’s running at on my M1 (intel shows 30 bit framebuffer in System Report, M1 shows nothing). SwitchResX software is reporting that it’s running in “Millions of Colors” (8 bit), but I’m not sure if that’s true. The same setup is reporting Billions of Colors on an intel MacBook. It overall seems to be there’s things missing for the XDR <-> M1 interactions :S

liquidise 5y ago

DSC was arguably the hallmark change of DisplayPort 1.4[1]. To say something is "only capable of achieving" its performance by utilizing the very tech it is built on feels like there has been a misunderstanding somewhere. To be clear, Display Stream Compression is different from Chroma Subsampling[2], which the parent referenced. 1. https://en.wikipedia.org/wiki/DisplayPort#1.4 https://en.wikipedia.org/wiki/DisplayPort#1.4 2. https://en.wikipedia.org/wiki/Chroma_subsampling https://en.wikipedia.org/wiki/Chroma_subsampling

KolenCh 5y ago
“Only capable of achieving” is likely referring to it being lossy. It is reasonable for some consumers or manufacturers to not settled with lossy.
- lsaferite 5y ago
  FWIW, DSC is claimed to be lossless. https://www.cablematters.com/blog/DisplayPort/what-is-display-stream-compression https://www.cablematters.com/blog/DisplayPort/what-is-displa...
  - wtallis 5y ago
    "Visually lossless" isn't really lossless. What it actually means is "we're pretty sure you won't notice", which is probably correct but isn't a claim that should be accepted at face value.
    - lsaferite 5y ago
      Which is precisely why I included the "claimed" part in my statement. I don't know enough about how the compression works to know one way or the other definitively.
    - account42 5y ago
      To put it another way, there is no such thing as general lossless compression - to make some data smaller without losing any information your new representation has to make other data larger. You can limit that "larger" to 1 bit but you will still have some cases where the compressed data is definitly not smaller than the source so it will not help you with cases like this where there is a hard upper limit on how much data you can transport.
    - fomine3 5y ago
      VESA/display manufacturers should provide various DSC examples for consumer, rather than just saying "virtually lossless".
  - 5y ago

eek2121 5y ago

As a G9 owner, I'll say it can't even achieve 240hz with DSC. Look up all the G9 owners who have 3090s (or other cards) and experience interlaced output when the refresh is set to 240hz on their G9s, including me.