I've recently got a 32" 6K (6144x3456) display for my M4 Mac mini. Turns out 10-bit RGB at 60Hz requires about 38Gbps bandwidth, which is just slightly below the theoretical limit of Thunderbolt 4 and USB 4 (40Gbps), but the actual video signal inside TB4/USB4 is DisplayPort 1.4 which can only offers a little bit less than 26Gbps after coding overhead. So it has to be compressed using DSC to work.

Luckily the M4 Mac mini comes with an HDMI 2.1 port allowing 42Gbps data rate after deducting overhead, and that's the one I'm currently using to attach the 6K display. Only the M4 Pro/Max-equipped Macs offer Thunderbolt 5 with DisplayPort 2.0/2.1 (~77Gbps data rate).

And people are asking if the 6K display can do high refresh rate like ProMotion at 120Hz…

I just wish the TV and monitor industries could just stop fighting and get a unified ultra high bandwidth standard to work. I'm so fed up with the hard choice we're forced to make regarding DP vs HDMI.

I'm still salty about the lack of DisplayPort adoption by manufacturers. I have a new video card with DP 2.1 and new monitor (2025) with only DP 1.4. I'm forced to use hdmi if I want full bandwidth without dsc.

A 2025 monitor with DP 1.4 from 2016. Shame.

16K@60 must be some DSC enabled mode, because the math isn't mathing for me otherwise: 96 gigabits/sec should be capping out at 16K@30 (and that's at SDR, so 8 bits per channel).

At least we can get some decent speed at FHD now (1920 Hz). I doubt any manufacturer will bite though sadly, even though OLEDs should be capable of maintaining refresh rate compliance. 4K@480 is still a nice improvement at least, even if a fairly incremental one. I do expect those to appear on the market.

Any further word on the recently announced GPMI out of China?

* "GPMI set to deliver up to 192Gbps and 480W through a single USB cable": https://news.ycombinator.com/item?id=43607155

* "China launches HDMI and DisplayPort alternative – GPMI up to 192 Gbps, 480W": https://news.ycombinator.com/item?id=43602154

* https://en.wikipedia.org/wiki/GPMI

Took them long enough Besides, why bother using that, when you can use an open source alternative, like DP

I know the answer is that users have used hdmi longer

Finally. All I want for Christmas is a 5K, HDR, 120Hz display. I'm managing with 4K, 120Hz, and scaling to 2560x1440 in Mac OS, but with the latter option I lose HDR. I can't give up 120Hz after getting used to it on all my devices.

Does that mean I can use the same 1080p screens I always have, but at 960Hz?

I look forward to seeing this in consumer devices in 2040 plus the usual fiasco of defective AVR chips for the first generation.

Are 90% of features still optional? You can be hdmi 2.1 compliant without VRR, QMS, etc.

At those bandwidths, resolutions seems rather silly to invest in to. Having used high-hz screens for a long time, 60 hz is starting to seem quite broken for me.

120hz+ at lower resolutions first seems a lot more useful, unless one is doing some 360 degree video thing that has relatively very low amount of pixels per degree of angle. Doubling framerate is only double the cost, while doubling width&height is quadruple the cost.

I've never actually looked into this so maybe this is a dumb question but how hard would it be to make a symmetrical HDMI cable with no "up" or "down"? USB-C was rightfully lauded for this but I personally have a much more frustrating history reaching around the back of tvs with an upside down HDMI cable.

Just as a reminder, the HDMI Forum is forbidding AMD from releasing an open source HDMI 2.1 driver for Linux:

https://www.phoronix.com/news/HDMI-2.1-OSS-Rejected

Displayport is the better technology in every way possible.

If only they did not block opensource drivers.