Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Sure thing, have in mind though that full support for the Dell UP3218K seems to be coming in macOS Ventura.

Right now in macOS Monterey each half of the monitor will be recognised as independent 3840x4320 pixel displays (or 1920x2160 HiDPI).

First we need to add the 3840x4320 resolution. The easiest solution is to install SwitchResX and use the 10-day trial (although seeing as you run Avid hardware and software you or the company should be able to cover the €14 license).

1. Download SwitchResX
2. Install it
3. Navigate to  -> System Preferences
4. In System Preferences you should now have an SwitchResX panel

View attachment 2033472

5. Open it and click on the first monitor (DELL UP3218K), then click on Custom Resolutions and lastly the + sign.

View attachment 2033473


6. Add the 3840x4320 resolution (the HiDPI option will be added automatically) and reboot. SwitchResX ask if you want to save the changes, say yes.
7. After reboot go to  -> System Preferences and open SwitchResX preferences
8. Launch SwitchResX Daemon (it should appear in the menu bar) and select either the full resolution (3840x4320@60Hz) or the HiDPI resolution (1920x2160@60Hz) for both monitors


The only caveat as mentioned up top is that it is recognised as two separate displays, so the menu bar will only be on one side of the screen.

To stretch applications over both "screens" you need to go to System Preferences -> Mission Control and deselect the option "Displays have separate Spaces". If you full screen an application it will only cover one side of the screen.

This should be the most straightforward way to obtain 8K60 but if this doesn't work I have two other things we can try.
22DD0278-C443-4AEE-8657-4031B1765C64.jpeg


I tried the Monterey Method it keeps saying invalid resolution after i restart when I try to add custom resoultion.

So i did a clean install of Ventura, and it still sees it as 2 separate monitors. Any advice?
 
I haven't tried Ventura myself on an Intel machine.

@joevt do you have any suggestions? Shouldn't 8K60 work in Ventura now?
8K60 on Dell UP3218K requires Ventura, a Mac Pro 2019, and something else but I don't know what the something else is. So I made a patch to remove the Mac Pro 2019 and whatever checks.

You need an installation of OpenCore/Lilu/WhateverGreen (my fork). You can put them on an EFI partition or a new FAT partition (at least 200 MB).
Then you boot the Mac holding the option key, use the arrow keys to select the OpenCore icon, hold the control key down so the up arrow turns into a circular arrow and press return. This makes OpenCore the default booter. Then in OpenCore do the same for the macOS. Using the control key in OpenCore makes the selected macOS the default booter from OpenCore. OpenCore will load Lilu and WhateverGreen which contain the patch. Then the display should be able to do 8K60.
If you want to try the patch then I'll zip the required files.
 
And FYI for folks lining up your two halves of the screen with SwitchResX, be aware you can use AppleScript with SRX to get, and set the position coordinates of the displays to the precise pixel, which the monitors prefpane doesn’t allow.

I use displayplacer for this to align my horizontal + vertical Dell 2720's down to the pixel. It's handy because you can do it all via CLI. Basically...

  1. brew install displayplacer
  2. displayplacer list
  3. Copy the sample command given at the very end of the output
  4. Paste back into the terminal and tinker with the pixel values, and keep retrying until I have my monitors aligned
 
  • Like
Reactions: tsialex
So for whatever reason I had to change the TV port I plugged into, to port 2. It's been working pretty well there. Today I had some issues with sync (sometimes happens when you have the machine asleep and the TV turns off and when it comes back on). So I decided to try unplugging it from port 2 and back into HDMI port 1 on the Samsung TV.

The TV just did not want to show through HDMI port 1 on the TV. Not sure why. And I'm not sure if I was dreaming/imagining that I had been using it on port 1. Anyway, I put it back in HDMI port 2, and toggled between 8k at 30hz back to 8k@60hz via SwitchResX a few times (for whatever reason, doing that seems to get the TV to accept the sync) and it came back on like no problems.

Soooooo, if you have the TV and you tried to get it work, and it didn't, and you were on HDMI port 1, you might try it on Port 2, or some other port on the back of the TV. And do the SwitchRexX toggle back and forth a few times at each port to see if one of the ports is more friendly than the other. For whatever random reason, on my TV it really likes HDMI port 2 better (at least over HDMI port 1). I haven't tried HDMI port 3 which has some extra e-arc stuff, or port 4, figuring I'll leave well enough alone.

I updated the "working" post to show I'm in HDMI port 2 for anyone else that wants to try it. Hope that helps.
 
So for whatever reason I had to change the TV port I plugged into, to port 2. It's been working pretty well there. Today I had some issues with sync (sometimes happens when you have the machine asleep and the TV turns off and when it comes back on). So I decided to try unplugging it from port 2 and back into HDMI port 1 on the Samsung TV.

The TV just did not want to show through HDMI port 1 on the TV. Not sure why. And I'm not sure if I was dreaming/imagining that I had been using it on port 1. Anyway, I put it back in HDMI port 2, and toggled between 8k at 30hz back to 8k@60hz via SwitchResX a few times (for whatever reason, doing that seems to get the TV to accept the sync) and it came back on like no problems.

Soooooo, if you have the TV and you tried to get it work, and it didn't, and you were on HDMI port 1, you might try it on Port 2, or some other port on the back of the TV. And do the SwitchRexX toggle back and forth a few times at each port to see if one of the ports is more friendly than the other. For whatever random reason, on my TV it really likes HDMI port 2 better (at least over HDMI port 1). I haven't tried HDMI port 3 which has some extra e-arc stuff, or port 4, figuring I'll leave well enough alone.

I updated the "working" post to show I'm in HDMI port 2 for anyone else that wants to try it. Hope that helps.

One other weirdness. The Samsung can get 'stuck' in weird ways. Sometimes I turn it on and only some of the backlight lights are on. Turning it on and off with the remote will not reset it. But pulling the HDMI plug out and back in will. But then for some reason the PC/Screen cannot sync and the only way to get it back to working is to shut everything down (the computer, the screen, the UPS powering both of them), turn it all back on and then boot with the screen already turned on.

I suspect, but havent tried, that such a forced cold reboot might let me plug into some port other than HDMI port 2, but it's so much wasted 'jiggle time' that I havent bothered with that.

Again, might be useful for anyone trying that does not get instant results.
 
Now with Ventura officially released have anyone had any luck with an 8K display? 😅

Mine still works after the upgrade. It does not seem any 'better' though, but I'm still using the SwitchResX solution. No new resolution options seemed to pop up.

1667253448720.png
 
Ugh, that settings app is really going to take some getting used to
Yea, it's a UI ****show. They made access to everything about as inefficient as humanly possible. Arranging screens and resolutions should all be in one pane. You click on a screen position and see all the settings for it. Not complicated. Much like it used to be in the long ago...
 
You got a link?
It was in e-mails. My forks are on GitHub.

Build it like this (change MyProjects to wherever you like):
Code:
MyProjects="/Volumes/Work/Programming/KextProjects"
mkdir -p ${MyProjects}/MacKernelSDK
mkdir -p ${MyProjects}/Lilu
mkdir -p ${MyProjects}/WhateverGreen

cd ${MyProjects}/MacKernelSDK
git clone https://github.com/joevt/MacKernelSDK joevt-MacKernelSDK

cd ${MyProjects}/Lilu
git clone https://github.com/joevt/Lilu.git joevt-Lilu
cd ${MyProjects}/Lilu/joevt-Lilu
ln -s ${MyProjects}/MacKernelSDK/joevt-MacKernelSDK MacKernelSDK
# use Xcode to build Lilu

cd ${MyProjects}/WhateverGreen
git clone https://github.com/joevt/WhateverGreen.git joevt-WhateverGreen
ln -s ${MyProjects}/MacKernelSDK/joevt-MacKernelSDK MacKernelSDK
ln -s ${MyProjects}/Lilu/joevt-Lilu/DerivedData/Lilu/Build/Products/Debug/Lilu.kext Lilu.kext
# use Xcode to build WhateverGreen

Install OCLP. It has a “Allow native models” setting you can enable for Macs that support Ventura.
Replace OCLP's Lilu.kext and WhateverGreen.kext with the ones you just built.

boot-args in the config plist should include:
-liludbgall -liludump=240 -lilubetaall dpd=2

dpd=2 does the UP3218K patches.
liludump=240 will cause a Lilu log file to be saved at /var/log four minutes after boot (sort by date modified in descending order).
The log file will show how many of the userland patches were made.

If it works, then maybe you can try removing liludump and liludbgall from boot-args to make booting faster.
 
Last edited:
Guys, is there a chance to run OSX at 8k - 60 Hz ( Samsung Q900A TV ) ?
Hackintosh, Mac Mini or whatever it is
I'd really like to run OSX on this beautiful display.
I have 4 x HDMI 2.1 on the Samsung
My Windows PC - RTX 4090, 32 GB DDR4, mainboard - Asus ROG Strix Z690 Gaming D4
AFAIK, OSX does not support RTX 4090 / 3090 ( i have that one, too )
I could buy a mini PC if I'd knew it works at 8k-60 Hz ( with AMD GPU )
Could you please, give me some advices ?
Thank you
 
Guys, is there a chance to run OSX at 8k - 60 Hz ( Samsung Q900A TV ) ?
Hackintosh, Mac Mini or whatever it is
I'd really like to run OSX on this beautiful display.
I have 4 x HDMI 2.1 on the Samsung
My Windows PC - RTX 4090, 32 GB DDR4, mainboard - Asus ROG Strix Z690 Gaming D4
AFAIK, OSX does not support RTX 4090 / 3090 ( i have that one, too )
I could buy a mini PC if I'd knew it works at 8k-60 Hz ( with AMD GPU )
Could you please, give me some advices ?
Thank you
You should probably read this thread. You know, all those posts *before* yours.
 
Okay, I did, not the entire thread. I'll try again
The problem is, I do not speak / understand well, english
I'm a bit confused with some IT / OSX / TV settings / terms
 
Guys, is there a chance to run OSX at 8k - 60 Hz ( Samsung Q900A TV ) ?
Hackintosh, Mac Mini or whatever it is
I'd really like to run OSX on this beautiful display.
I have 4 x HDMI 2.1 on the Samsung
My Windows PC - RTX 4090, 32 GB DDR4, mainboard - Asus ROG Strix Z690 Gaming D4
AFAIK, OSX does not support RTX 4090 / 3090 ( i have that one, too )
I could buy a mini PC if I'd knew it works at 8k-60 Hz ( with AMD GPU )
Could you please, give me some advices ?
Thank you

I think the odds of the RTX working is very low. I forget what operating system was the last one that supported Nvidia graphics. Mojave?

 
I could build another PC, with AMD, but first, I want to make sure, it's going to work at 8k - 60 Hz on Samsung QN900A
 
I could build another PC, with AMD, but first, I want to make sure, it's going to work at 8k - 60 Hz on Samsung QN900A

Sorry cannot comment on your proposed rig. As is, with the equipment I list, I barely have this working. Yes, I have it working at 8k and 60hz but no one else seems to have replicated what I have. :(
 
Sorry cannot comment on your proposed rig. As is, with the equipment I list, I barely have this working. Yes, I have it working at 8k and 60hz but no one else seems to have replicated what I have. :(
Do you use only OSX, or Windows, as well ?
Did you fix the blurry fonts ( BGR subpixels ) ? If " yes " how ?
 
Do you use only OSX, or Windows, as well ?
Did you fix the blurry fonts ( BGR subpixels ) ? If " yes " how ?

I used it with windows 10 and it works FABULOUSLY under windows. Really great there. Under OSX, it's janky to get it going after screen turns off (asleep for long times) but once you get it back, it stays on solid. Under windows, it just works great the entire time.
 
What exactly did you do, to make it work fabulously, under Windows 10 ?
Game Mode on, right ? HDMI 2.1 cable or some DP to HDMI 2.1 cable ?
 
What exactly did you do, to make it work fabulously, under Windows 10 ?
Game Mode on, right ? HDMI 2.1 cable or some DP to HDMI 2.1 cable ?

Absolutely nothing. I installed windows 10/bootcamp, plugged it in, and it just worked great.

Well, meaning with all the same hardware/cables I listed here to make it work in macOS. Also it worked great with multiple cables too. It worked best, not surprisingly, with a pure HDMI2.1 cable, but also with the displayport->HDMI cable I used for macOS. But worked perfectly with just a plain Jane HDMI2.1-to-HDMI2.1 cable (which is what you would obviously prefer to use since it gives you more/full bandwidth).
 
Okay, thank you
I think, I'll give up on OSX
If you, and experimented user, have issues running OSX on your QN900A 8k - 60 Hz, I'll " die slowly "
:)
 
  • Like
Reactions: ZombiePhysicist
One thing I havent tried since the new operating system is just the HDMI2.1 cable with macOS 13.0.1. It would be amazing if that port/cable magically started to work!I Think I might try it later this week after I get a project out.
 
  • Like
Reactions: Arvine
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.