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ZombiePhysicist

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May 22, 2014
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UPDATE 2021-12-19: (Some failed tests I tried to get it to work) https://forums.macrumors.com/thread...2-0-displays-on-mac-pro.2309750/post-30712355

UPDATE 2021-12-26: A first solution can be found here: https://forums.macrumors.com/thread...2-0-displays-on-mac-pro.2309750/post-30729673


So after following this thread, I'm thinking of finally replacing my 6 30" Cinema Displays with one or 2 8k displays. They have finally gotten cheap enough that it's worth a try. The question is, what graphics cards support 8k displays on the Mac Pro (mine is a 7,1 and currently has a 9100WX with 6 display ports that I dont think will do the job)?

The new AMD Radeon 6xxx series supports HDMI 2.1 (which supports 8k) on their native cards but apple's version seem to be only HDMI 2.0, which is astounding as they would have had to have worked more to cripple their displays:




So one option is to ignore the apple offerings and just get one of the PC AMD 6000series cards with a confirmed 2.1 HDMI port. Or perhaps apple's cards do have HDMI 2.1 or can drive 8k monitors?


I was thinking of getting this 8k display and maybe some of these adapters would work?


or these together might be better:


And might need this software to help:

This TV seems pretty nice and is currently $2900 and $500 amazon kickback, so $2400. Seems like a killer deal.


Has anyone tried any of this to work? Appreciate any pointers or thoughts.
 
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ZombiePhysicist

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What distance will you be sitting from the TV?

I think somewhere between 24-32". That's how close my 6 30" displays are, so this should work well. Unfortunately none of the 8k displays are curved. However, my 3 across 30" screens span between about 75" and 80" wide, so the 65" screen will be much more in my field of view.
 

jmho

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Jun 11, 2021
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Note that QLED is not OLED and is essentially the same LED local dimming technology as the Pro Display XDR which you called "crap".

As far as I know the only 8k OLED screen is the LG 88 inch Z1 which costs $30k.
 
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ZombiePhysicist

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Note that QLED is not OLED and is essentially the same LED local dimming technology as the Pro Display XDR which you called "crap".

As far as I know the only 8k OLED screen is the LG 88 inch Z1 which costs $30k.

Agreed. There is no replacement for OLED for now (well there is micro led, but for now it's only available on Samsungs giant expensive wall product). And agree, it's crap compared to OLED, and probably even crappier than apple's XDR tech.

Color fidelity for me is not paramount. I'm currently living with my ancient 30" cinema displays which are frankly garbage by modern standards. Eventually I want to get 8k OLED, but right now LG is the only maker of a 77" and 88" models costing 20 or 30k.

And for now, I value desk space resolution over black level or color fidelity performance, so it's a compromise to be sure.
 

ZombiePhysicist

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One option I guess is you could buy 4x LG C1 48 inch screens and then make one giant makeshift 8k 96" OLED monster that could be driven at 120hz if you have enough outputs.

True, and and a cool idea.

Although I'd really love to move to full 8k. It basically would let me pare down (I think) from my 6 screens to 1. And there is something really nice (to my mind) and tidy about needing only one display (albeit a sizable one).
 

ZombiePhysicist

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I found this article informative.


Enable8K-01.png

DataCapacity_Rev3.png


Display port 2.0 will have around 80gbps throughput and can support crazy stuff but still not coming out till later this year. HDMI 2.1 does 48gbps and supports 8k fully.

But, you only need around 25gbps to do 8k at 30fps and frankly that would be fine. So a lot of display port 1.4 ports in can support 8k at 30fps, and of course HDMI 2.1 does 8k as well.
 
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joevt

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Jun 21, 2012
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I found this article informative.


Enable8K-01.png

DataCapacity_Rev3.png


Display port 2.0 will have around 80gbps throughput and can support crazy stuff but still not coming out till later this year. HDMI 2.1 does 48gbps and supports 8k fully.

But, you only need around 25gbps to do 8k at 30fps and frankly that would be fine. So a lot of display port 1.4 ports in can support 8k at 30fps, and of course HDMI 2.1 does 8k as well.
They mixed up data bandwidth and wire bandwidth but the conclusion remains unchanged.

24.48 Gbps and 49.65 Gbps may be valid data bandwidth (but it doesn't look like they used CVT-RB or CVT-RB2 or HDMI timings to calculate those).

DisplayPort 1.2 is actually 17.28 Gbps because 8b/10b (it takes 10 bits on the wire to encode 8 bits of data).
DisplayPort 1.4 is actually 25.92 Gbps because ditto.
DisplayPort 2.0 is actually 77.37 Gbps because 128b/132b and FEC.
HDMI 2.1 is actually 42.67 Gbps because 16b/18b.

They mentioned DSC which can effectively double the bandwidth (I think 3:1 is possible but Apple does 2:1 if they enable DSC at all - Big Sur doesn't enable DSC in some (most?) situations). Another way to double the bandwidth is to use 4:2:0 chroma sub sampling (chroma sub sampling reduces color resolution but luminance is still max resolution). DisplayPort 1.2 can't do 4:2:0 but it can do 4:2:2 which allows for 150% bandwidth.

I don't think anyone has shown 8K60 support in macOS from DisplayPort 1.4 to HDMI 2.1 adapters. There's a couple of these conversion chips:
- Synaptics VMM6100 as in the Cable Matters 201388.
- Realtek RTD2173 as in the Club 3D CAC-1085.
https://forums.macrumors.com/thread...ransfers-recommendation.2278473/post-29466205

I don't think anyone has shown 8K60 support in macOS from HDMI 2.1 ports of AMD 6000 series cards? (not MPX modules)

I can get 8K30 from DisplayPort 1.4 (RGB, no DSC) in macOS at least. I don't have any display that can do 8K60 yet.
 
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ZombiePhysicist

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They mixed up data bandwidth and wire bandwidth but the conclusion remains unchanged.

24.48 Gbps and 49.65 Gbps may be valid data bandwidth (but it doesn't look like they used CVT-RB or CVT-RB2 or HDMI timings to calculate those).

DisplayPort 1.2 is actually 17.28 Gbps because 8b/10b (it takes 10 bits on the wire to encode 8 bits of data).
DisplayPort 1.4 is actually 25.92 Gbps because ditto.
DisplayPort 2.0 is actually 77.37 Gbps because 128b/132b and FEC.
HDMI 2.1 is actually 42.67 Gbps because 16b/18b.

They mentioned DSC which can effectively double the bandwidth (I think 3:1 is possible but Apple does 2:1 if they enable DSC at all - Big Sur doesn't enable DSC in some (most?) situations). Another way to double the bandwidth is to use 4:2:0 chroma sub sampling (chroma sub sampling reduces color resolution but luminance is still max resolution). DisplayPort 1.2 can't do 4:2:0 but it can do 4:2:2 which allows for 150% bandwidth.

I don't think anyone has shown 8K60 support in macOS from DisplayPort 1.4 to HDMI 2.1 adapters. There's a couple of these conversion chips:
- Synaptics VMM6100 as in the Cable Matters 201388.
- Realtek RTD2173 as in the Club 3D CAC-1085.
https://forums.macrumors.com/thread...ransfers-recommendation.2278473/post-29466205

I don't think anyone has shown 8K60 support in macOS from HDMI 2.1 ports of AMD 6000 series cards? (not MPX modules)

I can get 8K30 from DisplayPort 1.4 (RGB, no DSC) in macOS at least. I don't have any display that can do 8K60 yet.

do you have a display doing 8k@30. That would be enough for me for now. What card/display setup are you using. Thanks!
 

joevt

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Jun 21, 2012
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do you have a display doing 8k@30. That would be enough for me for now. What card/display setup are you using. Thanks!
I think any AMD card supporting DisplayPort 1.4 should work. I have W7500 and RX 580.

The display is an Acer XV273K. It's a 4K display but it accepts a 8K 30Hz signal from DisplayPort 1.4. SwitchResX and AGDCDiagnose and the display's onscreen menu show the output signal is 8K30. The scaling to 4K is done by the display. The Dell UP3218K is a real 8K display that also support 8K30 from macOS (with help from SwitchReX). It has a dual tile 8K60 mode but macOS doesn't support arbitrary dual tile displays (macOS supports dual tile SST for 5K60 and 6K60 and dual tile MST for 4K60 but not dual tile SST 8K60 or 4K144). The Acer XV273K has a dual tile 4K144 mode but I haven't gotten it to work in macOS.

You'll probably be wanting a HDMI 2.1 display. Support for 8K on those might be problematic because of macOS limits for HDMI. We need people to report their failures or successes. Maybe a patch can fix it (Lilu + Whatevergreen) if there's a problem.
 
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Pressure

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The Dell UP3218K will get you 8K@30Hz with a single DP cable.

Other option is to wait for the ViewSonic VP3286-8K, which should work at 8K@60Hz with a single cable and DSC.

UPDATE: I got the Dell UP3218K working at 8K @ 60Hz by plugging in both cables and use one-key-hidpi to enable HiDPI and then used SwitchResX to change both sides of the screen to 1920x2160 HiDPI mode.
 
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ZombiePhysicist

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The Dell UP3218K will get you 8K@30Hz with a single DP cable.

Other option is to wait for the ViewSonic VP3286-8K, which should work at 8K@60Hz with a single cable and DSC.

Thanks. I'm trying to use a TV. I think the 8K TVs are really good for the amount of display area I want. With the 27-32" monitors, the resolution will either be way too small, or at a level of sharpness that is meaningless to me. Plus, they are at better price points right now.
 

Arvine

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Dec 15, 2017
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The question is, what graphics cards support 8k displays on the Mac Pro (mine is a 7,1 and currently has a 9100WX with 6 display ports that I dont think will do the job)?
...
The new AMD Radeon 6xxx series supports HDMI 2.1 (which supports 8k) on their native cards but apple's version seem to be only HDMI 2.0, which is astounding as they would have had to have worked more to cripple their displays
...
Has anyone tried any of this to work? Appreciate any pointers or thoughts.

I have an AMD 6800 XT card in a Chroma egpu box, as well as a Samsung Q800 75" 8K monitor. I do get an 8K virtual desktop, but still not able to transfer an 8K signal to the TV. Even with SwitchResX it gets downsampled to 4K over either HDMI or Displayport 1.4. The card itself should support 8K, s well as the TV - so it seams there is a limitation in the MacOS or the AMD 6800/6900 driver that Apple has developed. I have tried different versions of MacOS Big Sur and Monterey.

Any news from others in the Mac community about getting 8k on MacOS?
 
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Tbro2

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Oct 26, 2021
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Thanks. I'm trying to use a TV. I think the 8K TVs are really good for the amount of display area I want. With the 27-32" monitors, the resolution will either be way too small, or at a level of sharpness that is meaningless to me. Plus, they are at better price points right now.
Only problem with 8K right now is that the support functions like menu bars, dialog boxes, dock and other non size-adjustable displays are really tiny!!.......& hard to read.
 

mattspace

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Jun 5, 2013
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Only problem with 8K right now is that the support functions like menu bars, dialog boxes, dock and other non size-adjustable displays are really tiny!!.......& hard to read.

Right, but Dell's 32" 8k display is 4k@2x which should theoretically be fine in terms of legibility.

Also, the Dock is literally size adjustable.
 
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Pressure

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Right, but Dell's 32" 8k display is 4k@2x which should theoretically be fine in terms of legibility.

Also, the Dock is literally size adjustable.
It is extremely usable. I can't imagine having less real estate after using 4K HiDPI for the last few years on a 32" monitor.
 
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joevt

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Right, but Dell's 32" 8k display is 4k@2x which should theoretically be fine in terms of legibility.
"Looks like 3840x2160" is probably usable but the Dell UP3218K has a higher DPI than even the UltraFine and XDR displays. But considering that I use the XDR's default "Looks like 3K" HiDPI mode on a 27 inch 4K display, I think it would be fine.
 
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Amethyst1

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But considering that I use the XDR's default "Looks like 3K" HiDPI mode on a 27 inch 4K display, I think it would be fine.
3840×2160 HiDPI on a 27" 5K is fun too, although that's pushing it just a bit for me.
 
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Arvine

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Dec 15, 2017
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I have an AMD 6800 XT card in a Chroma egpu box, as well as a Samsung Q800 75" 8K monitor. I do get an 8K virtual desktop, but still not able to transfer an 8K signal to the TV. Even with SwitchResX it gets downsampled to 4K over either HDMI or Displayport 1.4. The card itself should support 8K, s well as the TV - so it seams there is a limitation in the MacOS or the AMD 6800/6900 driver that Apple has developed. I have tried different versions of MacOS Big Sur and Monterey.

Any news from others in the Mac community about getting 8k on MacOS?
Short update here. Still no 8K signal to monitor/tv using AMD Radeon RX 6800 XT using latest version of MacOS Monterey 12.0.1. Resulr is the same as for the beta versions. The desktop is 8K but the signal transferred to Samsung Q800 8k TV over hdmi 2.1 (or DisplayPort 1.4 using HDMI 2.1 converter) is 4K@60hz. Looks like HDMI 2.0 timings. Needless to say, both the GPU and the TV supports 8K HDMI 2.1.

Have anyone tried the new MacBook Pro M1 Pro / Max with 8K over Thunderbolt 4 / DisplayPort ?
 

Pressure

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Short update here. Still no 8K signal to monitor/tv using AMD Radeon RX 6800 XT using latest version of MacOS Monterey 12.0.1. Resulr is the same as for the beta versions. The desktop is 8K but the signal transferred to Samsung Q800 8k TV over hdmi 2.1 (or DisplayPort 1.4 using HDMI 2.1 converter) is 4K@60hz. Looks like HDMI 2.0 timings. Needless to say, both the GPU and the TV supports 8K HDMI 2.1.

Have anyone tried the new MacBook Pro M1 Pro / Max with 8K over Thunderbolt 4 / DisplayPort ?
Have you tried with SwitchResX?
 

Lee2111

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Nov 1, 2021
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The Dell UP3218K will get you 8K@30Hz with a single DP cable.

Other option is to wait for the ViewSonic VP3286-8K, which should work at 8K@60Hz with a single cable and DSC.

UPDATE: I got the Dell UP3218K working at 8K @ 60Hz by plugging in both cables and use one-key-hidpi to enable HiDPI and then used SwitchResX to change both sides of the screen to 1920x2160 HiDPI mode.
Hi there!

Highly interested in your setting! :) I was considering buying the XDR because of the screen resolution (I do mainly coding), but if you managed to get it running Mac OS with a 8k monitor, I think many of us would be interested in knowing your configuration, if you don't mind? ?
 

Pressure

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Hi there!

Highly interested in your setting! :) I was considering buying the XDR because of the screen resolution (I do mainly coding), but if you managed to get it running Mac OS with a 8k monitor, I think many of us would be interested in knowing your configuration, if you don't mind? ?
Sure thing, you can read about it here.
 
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Arvine

macrumors member
Dec 15, 2017
32
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Have you tried with SwitchResX?
Yes I got a tip from @joevt to use SwitchResX. It helped to choose an 8K virtual desktop, as the MacOS Display Prefs has no option to choose 8K. But still it is only a 4K@60hz video signal that gets transferred to the TV. A screendump though will create a perfect 8K desktop image.

@Pressure here reports 8k@60hz but this is to "fool" the MacOS into believing the Dell UP3218K is actuallly two monitors (if I understand it correctly). But not all 8K monitors/TVs can spilt the screen into two (PiP).

I have not yet heard of anyone being able to get a "single desktop" 8K signal to a TV/monitor from a Mac. Not even a 8K@30hz signal. Seams to be limitations in MacOS og video drivers. Limitations connected to HDMI 2.1 and/or DSC?
 
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Pressure

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Yes I got a tip from @joevt to use SwitchResX. It helped to choose an 8K virtual desktop, as the MacOS Display Prefs has no option to choose 8K. But still it is only a 4K@60hz video signal that gets transferred to the TV. A screendump though will create a perfect 8K desktop image.

@Pressure here reports 8k@60hz but this is to "fool" the MacOS into believing the Dell UP3218K is actuallly two monitors (if I understand it correctly). But not all 8K monitors/TVs can spilt the screen into two (PiP).

I have not yet heard of anyone being able to get a "single desktop" 8K signal to a TV/monitor from a Mac. Not even a 8K@30hz signal. Seams to be limitations in MacOS og video drivers. Limitations connected to HDMI 2.1 and/or DSC?
I can drive the Dell UP3218K with a single DP cable at 8K@30Hz, so the limitation must be HDMI.
 
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