Dell 8K Dual Displayport 1.4 Monitor on macOS Catalina
 
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Dell 8K Dual Displayport 1.4 Monitor on macOS Catalina  

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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@mode80

You should be able to get8K 30Hz working in macOS.

You can try the mtdd file in the last posts of the tonymac thread. It won't work, but you can verify the result/behavior when you turn on the 8K display.

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Squuiid
(@squuiid)
Eminent Member
Joined: 1 year ago
 

@mode80

Any joy using the latest Catalina update 10.15.3 released today?

I cannot believe that Apple won't support this display when the old Dell 5K model is.

I'm hoping to use an RX5700XT in a Sonnet eGPU, using two DP1.4 cables.

I use both Bootcamp and macOS, but if I can't get macOS to work on the display in 8K60 it's unfortunately a deal breaker.

Mac mini 2018, i7 3.2GHz 6c, 32GB RAM, 1TB SSD, 10GbE, Sonnet eGFX 350W (Noctua NF-A12x25 ULN) + PowerColor RX 5700 XT 8GB, TEKQ Rapide TB3 1TB SSD, macOS Catalina, Win10 Pro
Mac Pro 2010, X5690 3.46GHz 6c, 64GB RAM, Samsung SM951 512GB, Sapphire Pulse RX 580 8GB, Intel X540-T1 10GbE, Allegro Pro USB 3.0, AC/BT 4.2, macOS Mojave


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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@squuiid

There doesn't appear to be any changes in the /System/Library/Displays/Contents/Resources/Overrides/ folder.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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mode80
(@mode80)
New Member
Joined: 8 months ago
 

Yeah, I upgraded to Catalina 10.15.3, but with both cables connected, it still shows up as two different 4k displays in display preferences.

I haven't muddled with any mtdd files but if there's an easy to follow step-by-step that won't bork my machine, I'm game to try it. 😉

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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James Clarke
(@james_clarke)
New Member
Joined: 6 months ago
 

I'm in exactly the same situation, I've got a razer core x and amd 5700 xt and it simply won't see the screen as one 8k display, just two 4k displays.  I've tried messing around with SwitchResX and haven't managed to get it to work.  Any ideas would be much appreciated.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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Squuiid
(@squuiid)
Eminent Member
Joined: 1 year ago
 

10.15.4 Beta is out. It has fixed some serious Active Directory/FileVault issues in our enterprise environment but really hoping that 8K Dual SST has been fixed/added too.

Can anyone confirm 8K@60 on macOS 10.15.4?

Mac mini 2018, i7 3.2GHz 6c, 32GB RAM, 1TB SSD, 10GbE, Sonnet eGFX 350W (Noctua NF-A12x25 ULN) + PowerColor RX 5700 XT 8GB, TEKQ Rapide TB3 1TB SSD, macOS Catalina, Win10 Pro
Mac Pro 2010, X5690 3.46GHz 6c, 64GB RAM, Samsung SM951 512GB, Sapphire Pulse RX 580 8GB, Intel X540-T1 10GbE, Allegro Pro USB 3.0, AC/BT 4.2, macOS Mojave


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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@squuiid

Is there a /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147.mtdd file? If not, then there is probably no change for Dell 8K support.

The existing file at /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147 in Catalina 10.15.3 and earlier just removes the tile information:

  • 3840x4320 @ (#,0) of (2x1) vendor:DEL product:0x4147 serial:# enclosure:single some:undescribed one:scaled

and the following timings (the single cable low refresh 8K timings, and the tile timings)

  • 7680x4320@29.932Hz 130.742kHz 1030.25MHz h(30 10 160 +) v(3 5 40 -) 16:9 preferred
  • 7680x4320@24.000Hz 104.855kHz 826.26MHz h(48 32 120 +) v(3 5 41 -) 16:9 preferred
  • 3840x4320@48.000Hz 212.062kHz 856.73MHz h(48 32 120 +) v(3 10 85 -) 16:9
  • 3840x4320@60.000Hz 262.079kHz 1058.80MHz h(48 32 120 +) v(3 10 35 -) 16:9

 

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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Ray
 Ray
(@ray)
Eminent Member
Joined: 3 years ago
 
Posted by: @squuiid

10.15.4 Beta is out. It has fixed some serious Active Directory/FileVault issues in our enterprise environment but really hoping that 8K Dual SST has been fixed/added too.

I get the feeling that Apple is simply unaware that this problem exists in the first place. If they were, support would have definitely been added. I've reported/suggested it to them before… who knows, maybe if they get more people suggest it, it would find it's way onto the queue and be added. We can only hope, but seeing how it's been about 3 whole years, I get the feeling that they won't add this until there are more 8K displays demanding their attention.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 
Posted by: @ray

I get the feeling that Apple is simply unaware that this problem exists in the first place.

I'm sure they are aware of the problem. They took the time to create a useless override file for the display in macOS which means they know the display exists. They just haven't bothered doing the extra step of getting dual cable mode to work.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 
Posted by: @ray

I get the feeling that they won't add this until there are more 8K displays demanding their attention.

New 8K displays will use DSC instead of dual cable, so they will probably just work. The old 8K displays will never work unless you do 30Hz or YCbCr 4:2:0.

For the Dell 8K, I know 30Hz works on macOS. The EDID does not show support for 4:2:0. I would try an Nvidia DisplayPort 1.4 GPU in Windows with an override EDID created/applied by CRU to test 4:2:0 mode.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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