2018 Mac Mini [8th,6C,B] + Radeon VII @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.3 // inc Dell 3218K ( 8k 60Hz )
2018 Mac Mini
3.2 GHz Six-Core Intel Core i5
8 GB Ram (64 GB replaced)
256 GB SSD
MacOS Catalina 10.15.3
Dual-Displayport cable to Dell 3218K （scary 280 ppi retina display）
just plug in all the cables
MacMini -- TB3 --> Razer Core X+Radeon Vii -- 2DP --> Dell 3218K
Plug in the TB3 cable after booting , Otherwise it will occasionally be blackscreen.
Now the entire system is now ready for use.
Now Dell 3218K resolution is only 4k. how to make it 8K?
Here is an imperfect solution：
Enable Hidpi --> Set resolution to 2x(3840 x 4320 60Hz) --> Adjust menu bar and background --> Done
There is a script on Github https://github.com/xzhih/one-key-hidpi
Follow the instractions and customize resolution to 3840x4320, restart.（using “Enable highdpi (with EDID)” in the script.）
Set resolution to 2x(3840 x 4320 60Hz)
Use SwitchRes ,you may see 2 separate screen now.
Set both resolution to 1920*2160(hidpi).
Now its 8k/4k(Hidpi) 60hz
Rearrange display positions.
uncheck the 'Display has separate space' in Mission Control settings
cut a 8k wallpaper in half ,Set as wallpapers separately.
As a designer，this hardware combination is smooth and super clear.
Although it is recognized as two displays in the mac system，and the imperfect menu bar, everything is fine.
Hi, and thanks a lot for sharing these instructions! I got stuck on the part when I run the script. The script sees two monitors so I ran the script and set the resolution to 3840x4320 for both of them. But after rebooting and then setting a custom resolution in SwitchResX (and another reboot) only one “monitor” is detected (with no HiDpi option). Did this happen to you, or do you have any idea on what went wrong?
I did encounter this problem, but it was solved unexpectedly.
I did these things at the time, you can also try.
You can switch the source on the real monitor.
to Check that both DP1 and DP2 have signals. Maybe they cannot be displayed together at the incorrect resolution.
did u EXPORT EDID after （setting 3840 x 4320 and save settings）？
These screenshots are my current settings, Maybe you can get inspiration in comparison.
The two DisplayPort connections of the display have different EDIDs (one has tile info for the left side and the other has tile info for the right side).
SwitchResX only shows Custom Resolutions for one of them because both have the same product and vendor ID (they share the same list of custom resolutions because they use the same override file in /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/).
Might be nice for SwitchResX to show the tile number of each display but maybe that part is not included in the EDID that SwitchResX sees (the override file replaces that part of the EDID)? The real EDID is available from AGDCDiagnose output.
The following is a list of timings from the real EDID (the last four are removed by Apple's override file - they include the 8K 24Hz and 30Hz timings and the half wide 3840x4320 timings):
firstname.lastname@example.orgHz 133.313kHz 533.25MHz h(48 32 80 +) v(3 5 54 -)
email@example.comHz 65.688kHz 262.75MHz h(48 32 80 +) v(3 5 23 -)
firstname.lastname@example.orgHz 88.787kHz 241.50MHz h(48 32 80 +) v(3 5 33 -)
email@example.comHz 66.649kHz 147.16MHz h(48 32 80 +) v(3 10 18 -)
firstname.lastname@example.orgHz 26.268kHz 58.00MHz h(48 32 80 +) v(3 10 6 -)
email@example.comHz 130.742kHz 1030.25MHz h(30 10 160 +) v(3 5 40 -) 16:9 preferred
firstname.lastname@example.orgHz 104.855kHz 826.26MHz h(48 32 120 +) v(3 5 41 -) 16:9 preferred
email@example.comHz 212.062kHz 856.73MHz h(48 32 120 +) v(3 10 85 -) 16:9
firstname.lastname@example.orgHz 262.079kHz 1058.80MHz h(48 32 120 +) v(3 10 35 -) 16:9
Thank you very much for the great information and the screenshots! I will try again tomorrow to get this setup working and report back :).
@wizard5896741, Still a bit stuck, only seeing one display after enabling HighDPi. You mention that I should export EDID after setting 3840x4320. Where should I export it to I what is that .txt file used for?
I also don’t have the 1920x2160 option in SwitchResX by default. Do I need to add that as a custom resolution? I get “Not valid - Invalid” on all my custom resolutions also after a reboot :(.
As you see I am a rookie on messing with these settings, so trying to learn now.
forget about the EDID.
Do I need to add that as a custom resolution? I get “Not valid - Invalid” on all my custom resolutions also after a reboot
yes, add a custom resolution. And Check 「use simplified setting」.
I`m a rookie too , just try different keywords about your problems on google and forums. eventually you will solve them. ；）
Got it working after using “Enable highdpi (with EDID)” in the script.
How is your behavior of the monitor(s) after a reboot? I get a lot of random custom resolutions with strange letters in SwitchResX and the setup breaks.
Thanks for all the help 👍!
@psicotec, That's great！
Only this 3840 x4320 resolution is set by myself, others may be generated by the script.
After reboot, apple logo will appear on half screen, but occasionally the screen goes blank.
So, I plug in the egpu TB3 after a few seconds.