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0 pointsartimaeis4y ago0 comments

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

0 comments

liquidise4y 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

2. https://en.wikipedia.org/wiki/Chroma_subsampling

KolenCh4y 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.

lsaferite4y ago

FWIW, DSC is claimed to be lossless.

https://www.cablematters.com/blog/DisplayPort/what-is-displa...

2 more replies

cehrlich4y 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.

brigade4y 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.

radicality4y 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

eek21214y 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.

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