Would this allow the Dell UP3218K monitor to work at 8k@60hz?

[jamesdh]

The Dell UP3218K is the only 8k computer monitor on the market at the moment. Unfortunately, the only connectivity it offers is 2xDisplayPort 1.4 without DSC, with each cable comprising half of the screen (as a tiled display). Since MacOS doesn't properly support MST, that means the only option for connecting this monitor to MacOS is to use a single cable, which only allows for 8k@30hz, unless you were cool with running each half of the screen in mirrored mode (which is what you get when connecting both cables).

Does BetterDummy offer some way to work around this? There are numerous threads on MacRumors regarding this, but nobody seems to have a real solution to it.

[waydabber]

The following could be done:

• Connect the two halves of the display each 3840x4320 in size - these will form two independent screens
• Create a single 7680x4320 virtual display (a dummy) which will form the single 8K desktop
• Cast to two drawable views to the two screens
• stream the dummy to these two views - one half to on and other half to the other

This will technically work but I am not sure about the performance. Also, since the two halves form two different displays, they sync separately which will form a visible tearing on fast moving scenes in the middle of the screen (just like it was the case with early 4K displays).

BetterDummy does not do this out of the box (the current public version has no streaming, the development version cannot stream to two view layers a single virtual display, as the need did not come up, but this can obviously be changed, it is a matter of coding only).

[jamesdh]

Ok, so you think it may be possible with some work. Thank you for the quick response!

The other possibility was to use something like these, which are basically a headless adapter on steroids, allowing pass-through. My guess is that it could be used to essentially trick your computer into thinking each DisplayPort connection is it's own monitor. But that's a big if.

[jamesdh]

Actually, on second inspection, it appears that adapter wouldn't work since it just mimics the hot plug detect signal, and therefore I'm guessing it simply passes the original monitors EDID information on through.

[joevt]

the only connectivity it offers is 2xDisplayPort 1.4 without DSC, with each cable comprising half of the screen (as a tiled display). Since MacOS doesn't properly support MST

MST is not what is needed here. The 2xDisplayPort 1.4 connections are SST. The problem is that macOS doesn't support arbitrary tiled displays. It can do old 4K MST tiled displays (except not for M1 Macs?). It can do 5K tiled displays (both 2160 and 2880 heights). It can do 6K tiled display. But it can't do 4K144 or 8K60 tiled displays.

My guess is that it could be used to essentially trick your computer into thinking each DisplayPort connection is it's own monitor. But that's a big if.

The Dell UP3218K display already has a PBP mode which is how you can connect it as two 3840x4320 displays.

If a patch to macOS to allow 8K60 tiled display cannot be found, then I guess the easiest method to get this to work would be the virtual display streaming to the two half displays of the 8K idea mentioned in the previous posts. I think the best way to solve this issue without having to depend on Apple would be an adapter that can take 8K60 DSC input and output two 3840x4320 signals. https://www.youtube.com/watch?v=EmOlxpvZq5M
This would have the benefit of not using up a second DisplayPort connection or any extra resources on the Mac (the virtual display idea would require some GPU power to move the display data around). Also it can be output from a single Thunderbolt port (you would need two Thunderbolt ports to do two 3840x4320 1058.80MHz 24bpp connections). And if you can get DSC to do 8bpp then you could output to two 8K60 displays from a single Thunderbolt port (I've only seen macOS do DSC 12bpp though).

[jamesdh]

Thanks @joevt for the clarification on MST/SST, that makes sense! I saw you mentioned this on MacRumors previously and was thinking the exact same thing!

[jamesdh]

Unfortunately, I doubt that we'll see any such device made. By the time something like that would finally make it to market, we'll probably have 8k monitors that support DSC available, effectively overcoming this limitation.

[waydabber]

Anyway, I added a feature request for this: #200

[jamesdh]

Thank you @waydabber! Also, not sure if this is helpful, but user "Pressure" was able to get his UP3218K working using a combination of one-key-hidpi and SwitchResX

[waydabber]

nice! :)

[joevt]

macOS 12.3 has a new .mtdd override file ( /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147.mtdd ) for the UP3218K. Does it work? You may need to remove any existing overrides you've created.

It has two tiled modes. One for 48Hz and another for 60Hz. I suppose the 48Hz might be needed for 10bpc?

[mrobbetts]

@joevt, this is the most exciting thing I've heard since I got this damn display in 2019! I'm only four months behind in noticing :)

Now, I've been using SwitchResX to get 8K@30Hz up until now. Now that I'm looking (on 12.4), it does seem that I can actually get 8K@30Hz just from the Mac System Preferences without using SRX! (although, all I have done is stop and disable the daemon from inside SRX, "Factory Reset" the settings, and reboot. I'm not sure if this is enough to "remove any existing overrides you've created" - if you can give any more guidance, I'd appreciate it).

This gives me 8K@30Hz. I can't screen-cap the drop-down for refresh rates, but it only shows 29.88Hz and 24Hz. If I select 3840 x 2160 (low resolution), I get 4K (and 60Hz is available).

This feels really close! Any ideas?

(As an aside, it's behaving flaky af. If I close my laptop screen, sometimes the Dell will go off and not come back up. Really anything that causes a change to display settings might lose the display and require a reboot.)

[joevt]

The override file that SwitchResX creates for 8K30 remains even when SwitchResX is not running (it is loaded by WindowServer / CoreDisplay.framework). You can remove the override file manually in the Finder, or use SwitchResX "Restore factory settings" button which does the same thing.

As for the update created by Apple for the UP3218K, I believe it's not actually working. You'll see in the displaypolicyd log file for your GPU (e.g. /var/log/displaypolicy/displaypolicyd.71:0:0.log) a message "NOTICE: Multi-cable display fallback with code 13, do simple" where simple means not-multi-cable mode.

But even before that message, you'll probably see these:
ERROR: Override File Malformed: 10ac:4147 missing property: /DisplayVendorID
ERROR: Override File Malformed: 10ac:4147 missing property: /DisplayProductID
which might be a good thing since that override file at /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147 is responsible for removing 8K30 support.

I've created a OpenCore/Lilu/WhateverGreen project that patches displaypolicyd to make it load overrides from /Library instead of /System (like what CoreDisplay.framework does), so that the override files used by displaypolicyd can be edited, but I don't know of any edits that can make multi-cable display work with the Dell UP3218K (8K60) or my Acer XV273K (4K144).
https://forums.macrumors.com/threads/mac-mini-4k-120hz.2267035/post-31207285

[joevt]

Of course, my WhateverGreen displaypolicyd patch doesn't apply to M1 Macs. I don't know what parts of macOS access override files for Apple Silicon Macs. Do they use WindowServer/CoreDisplay.framework and displaypolicyd? I don't think so?

We know that Apple Silicon Macs don't read EDID overrides from the /Library override files (which is what SwitchResX modifies). I wonder if EDID overrides from /System override files work? Of course, there's no easy way to modify System override files which is why I created the displaypolicyd patch. I think there's ways to modify System override files (you need to break the snapshot seal? Then reseal when you're done? I'm not sure.)

Maybe change SIP settings to disable detrace restrictions, then use the following command to see if a process (displaypolicyd in this example) accesses the override files when you connect a display:
sudo dtruss -n displaypolicyd
There's two override files files: the main override file with no extension, and then the .mtdd file.
/System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147
/System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147.mtdd
With my patch on an Intel Mac, you should see these files being accessed:
/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147
/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147.mtdd

[joevt]

Dell UP3218K might work 6K60 on MacPro7,1 running Ventura (brinlyau found some code in displaypolicyd that specifically mentions this display and the MacPro7,1). We don't know if it works yet. Currently working on a patch to remove the MacPro7,1 check.

[brinlyau]

Got it working at 8k60 :) on Ventura with a patch to remove the check!

I'll try clean up the hacky code we have and ideally not require OpenCore (maybe we can do a lldb based patch)!

[UniqueNameIdentity]

Can confirm the Dell UP3218K also works out of the box with the Mac Studio M2 Max.

[ssnickers700]

I would to point out that Mac has to be introduced in 2023 in order to have a support for 8k. Unfortunately plugging my Macbook Pro M2 2022 with Ventura 13.4.1 to Dell UP3218k using two USB-C to DP 1.4 cables results only in the half of the resolution of 8k and DP1 or DP2 input source instead of DP1 + DP2 just like @HansBouwmeester posted. Any tip would be much appreciated in case there is a solution here.

[gonfunko]

If you're using this one, with the plain M2 chip (as opposed to the M2 Pro, M2 Max or M2 Ultra), I think that's expected - the regular M2 (and the regular M3 for that matter) are only able to drive one external display, and since the UP3218K is effectively 2 displays, I don't expect it would work with a regular M2 or M3; the Pro, Max or Ultra variant is needed.

It's also possible that the plain M2 Mac mini may work, since that's documented as supporting 2 displays, presumably since it lacks a built-in one.

[joevt]

All Apple Silicon Macs support the LG UltraFine 5K display which is a dual tile display that uses two DisplayPort HBR2 x4 connections over Thunderbolt, one for each 2560x2880 half of the display. The same is true for the Dell UP2715K which does not use Thunderbolt.

The Dell UP3218K is also a dual tile display. It accepts two HBR3 x4 connections, one for each 3840x4320 half of the display. There's no reason it shouldn't work with all Apple Silicon Macs also, like the Dell UP2715K except that Apple limited the maximum size or total pixel rate on some of the Apple Silicon Macs (either in software or hardware) so that you have to buy a newer Mac or an Apple XDR display to get more than 5K.

[patroza]

Man how I love the glossiness of the 8k over the 6k matte... Just so sad that macOS doesn't do the x3 scaling, and 1440p scaled mode looks fuzzy, and the x2 scaling at 2160p is too small even for my somewhat younger eyes.

Hopefully they release a new glossy 6k dell at some point, the XDR is too expensive.

[brinlyau]

https://www.startech.com/en-au/display-video-adapters/tb32dp14 Is this the cable that you think will make the Dell UP3218k work? (I highly doubt it)

…

On Mon, 20 Feb 2023 at 19:43, eledtech1234 ***@***.***> wrote: @HansBouwmeester <https://github.com/HansBouwmeester> interesting, so in theory the M2 Max can support Tiled Display Topology Data Block with different video output port!? In the past separate video output ports on Mac are not sync properly, there is always screen tearing after sometime Can you try if it is sync properly without any tearing? e.g. https://www.youtube.com/watch?v=9hIRq5HTh5s Would be great if you loop something longer than 15 minutes (this is the usual out sync time on Intel Macs) in short: yes m2/m1 pro and max. long version: its not possible with 2 cables from 2 thunderbolt ports. you need a thunderbold dual display port adapter which support 8k. for now only startech works. we are on testing more adapters. i am trying to make a list until end of the week which adapters work. — Reply to this email directly, view it on GitHub <#199 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABECH2KQKUIKN4TQHSJKAT3WYMVE3ANCNFSM5JSHYVSA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[joevt]

2 cables from 2 Thunderbolt or DisplayPort ports is the only way to get 8K60 to the Dell UP3218K.

A Thunderbolt Dual DisplayPort Adapter cannot output the two HBR3 signals that the Dell UP3218K requires for 8K60. The only way that could possibly work is if you had two DisplayPort 1.4 MST hubs that each were taking a HBR2 DSC signal from the adapter and converting that to HBR3 for output to the Dell UP3218K.

5K and 8K dual tile displays do not use MST - they use dual SST. An MST hub can take MST input and output multiple SST.

Maybe windows or Linux could get 2 HBR3 signals from a single MST hub to support 8K60 to the Dell UP3218K. I know its possible for 5K60 but that's only 2 HBR2 signals. An MST hub can do 3 HBR2 signals for 3 4K60 displays. macOS does not support MST for multiple displays and I think Apple Silicon removes support of MST for old 4K60 dual tile displays.

[eledtech1234]

@joevt so you are on intel mac or apple silicon m1/m2 ?
it seems on apple silicon this "tiled-displays" are not working, when they are not directly supported from apple and connected over 2 thunderbolt ports.
a workaround for "2 tiles" displays is with this startech dual DP1.4 adapter. but yes it only supports 30hz. or 7680x2160 at 60p.

[joevt]

8K30 or 3840x4320@60Hz or 7680x2160@60Hz means only one of the DisplayPort connections is being used. Instead of using the Thunderbolt to Dual DisplayPort 1.4 adapter, you could just use a single USB-C to DisplayPort cable.

[anhnguyen301088]

My Mac Pro 7,1 recognized Dell UP3218K at 8K 60hz Mac OS Sequoia

[rat10]

My new Macbook Pro M4, Sequoia 15.2, did recognize the Dell UP3218K at 8K 60hz with two USB-c to DP 1.4 cables out of the box. So sharp, pure bliss! However, after two days it suddenly doesn't do so anymore. I woke it up from sleep and it was a mess at some resolution too low to remember. I fiddled, re-started, uninstalled SwitchResX, installed BetterMonitor instead, but to no avail. It does now run at 2160 x 3840 and I'm thoroughly frustrated. The cables I use are new, but not especially high quality. OTOH I don't know which cables would be high quality, and they didn't suffer any mechanical abuse.

[rat10]

I was in an Apple store and checked with a 6k Studio display: my Macbook is ok. Today a new set of cables from "Cable Matters" and the Thunderbolt dock arrived. The dock sure is cool, but the display is still only displaying 4k - with the new cables, with or without dock. So I guess I'll have to check with Dell how much a repair would cost.

[patroza]

fyi I used "StarTech.com Thunderbolt 3 to Dual DisplayPort Adapter DP 1.4 - Dual 4K 60Hz or Single 8K/5K TB3 to DP Adapter - Mac/Windows"

on an M3 pro max with Dell's 5k display, and it worked flawlessly.

[rat10]

I was with Dell support on the phone. They don't repair monitors. This is really unbelievable.

[rat10]

Ok, now this is getting really awkward: to my emberrassement I had to realize that the monitor does show a higher resolution as 4K on my 2019 Macbook Pro 16" (Intel 8-Core i9, AMD Radeon Pro 5500M 8 GB), namely 6720x3780 (which must be something like 6.5 K?). SwitchResX (v 4.13.2 Intel) does offer this: 6720x3780, 60Hz, NTSC, 16:9, and it works. MacOS (v 15.2) System settings/Display only offers 3840x2160 as the highest option (30Hz as well as 60 Hz, "show all resolutions" makes no difference). That doesn't change even after an update to MacOS 15.3.1.

So this is not a hardware problem: the 2024 Macbook can run 6K monitors in the Apple store without a problem and the Dell UP3218K monitor can display a "6.5K" resolution on the old Intel Macbook without a problem. So there must be a configuration issue somewhere.

In SwitchResX on the 2019 Intel Macbook the monitor is described as "Vendor: DEL-10AC" and most "Current Resolutions" are listed as "(NTSC"), e.g. "6720 x 3760, 60 Hz (NTSC)" (some however are "PAL", and some have no such marker). On the 2024 Arm Macbook the monitor is described as "Vendor: DEL-90AC" and non of the "Current Resolutions" has any added "(NTSC)" or "(PAL") marker. The new Macbook also runs a slightly newer version of SwitchresX, namely 4.14.1a1.

I already deleted the ~/Library/Preferences/ByHost/com.apple.windowserver.displays.<hex_string>.plist file as suggested in an Apple Forum thread here and even all other ~/Library/Preferences/ByHost/apple.windowserver.<hex_string>.plist files, but to no avail.
I also deleted /Library/Displays/Contents/Resources/Overrides/as suggested by the SwitchResX FAQ. Any advice for more files to delete?

I tried to configure "Custom resolutions" in SwitchResX for 7680 x 4320, 60Hz and even 6720x3780, 60Hz, but after reboot SwitchResX shows a "Not activated - invalid?" flag. Maybe there's a way to enable "NTSC" settings in SwitchResX? Maybe use a different timing than the default "CVT-RB" when configuring a custom resolution?

[patroza]

fyi I used "StarTech.com Thunderbolt 3 to Dual DisplayPort Adapter DP 1.4 - Dual 4K 60Hz or Single 8K/5K TB3 to DP Adapter - Mac/Windows" on an M3 pro max with Dell's 5k display, and it worked flawlessly.

Try this one maybe. As it advertises 8k

[rat10]

[joevt]

If you had an Intel Mac or PC running macOS, you could use AllRez to check the DisplayPort connections.

[rat10]

I've now figured out how to run AllRez on MacOS 15.3 (*) and it generated this report on my 2019 Intel Macbook.

Infos on the Dell UP3218K monitor start at line 697. IIUC they say that the monitor supports [email protected] max (line 835).
When running this test I also became aware that resolutions above [email protected]are pretty unreadable/smushy, so maybe there is indeed a hardware defect.

It would be great if somebody could have a look at the report and tell me if I interpret it correctly.

(*) just go to [System Settings / Privacy & Security], scroll down to "Security" and click to allow.

[jamesdh]

@rat10 see @joevt's reply here. I believe he accidentally commented outside of your subthread so you probably weren't aware of his response.

[waydabber]

@rat10 - Intel Macs with AMD can go way higher in terms of framebuffer resolution than Apple Silicon Macs. Generally non-pro Apple Silicon Macs can go up to 3072px HiDPI (6144px) and pro Apple Silicon Macs up to 3840px HiDPI (7680px) horizontally. Neither of them will however go beyond the max native resolution for HiDPI (contrary to Intel Macs). With the latest M4 and M4 Pro the situation is more awkward however - they provide support for more external displays in certain configurations but this comes at a price of a much more stringent resource management. The system (based on the native resolution of the display) tries to figure out the probably max framebuffer size (both horizontally and now with M4 vertically) the user might need and allocate a limit based on that (in a very limiting manner) so if subsequent displays are connected, those should have the resources needed. Because of this M4 Macs (even Pro/Max variants) generally underperform in terms of any headroom available for higher HiDPI resolutions.

[rat10]

@waydabber I'm not sure I understand everything you say, but Apple claims that the M4 Max can drive 2 displays up to 8K/60Hz over Thunderbolt. In my case it doesn't even drive one, not even when the 2 DP 1.4/USB-C cables are connected to a Kensington Dock, and that again via Thunderbolt 5 to the Macbook. That doesn't seem right, or to spec. Or do you suggest that the 3840 I'm seeing is HiDPI (and therefore actually 7680)? SwitchResX doesn't show the HiDPI flag for that resolution (whereas for others it does).

[waydabber]

Hi @rat10 - sorry, I was lost and did not properly get the context of the thread, just auto-replied based on a comment I received thinking I am somewhere else (an other thread about M4 Macs unable to reach certain HiDPI resolutions on non-8K displays). Please disregard my comment, it was not meant for this discussion. 😱

[rat10]

😅 Okay, and thanks for conforming!

[joevt]

I've now figured out how to run AllRez on MacOS 15.3 (*) and it generated this report on my 2019 Intel Macbook.

Infos on the Dell UP3218K monitor start at line 697. IIUC they say that the monitor supports [email protected] max (line 835). When running this test I also became aware that resolutions above [email protected]are pretty unreadable/smushy, so maybe there is indeed a hardware defect.

It would be great if somebody could have a look at the report and tell me if I interpret it correctly.

(*) just go to [System Settings / Privacy & Security], scroll down to "Security" and click to allow.

All the modes you are looking at are scaled modes with active pixels 3840x2160 and pixel clock 533MHz (4K60). SwitchResX shows you which modes are scaled and you can view their timing info by double clicking the mode in the Current Resolutions list.

There may be an EDID patch in the overrides file that removes the second extension block from the EDID. The second extension block contains the 8K30 single tile mode and also the Tiled Display Topology Data Block for the 8K60 dual tile mode.

But the biggest problem is that there's only one DisplayPort connection for the Dell UP3218K display and it might not be a good connection:

Connections:
* 1: [DP 1.2 4 x HBR2] 	 Status: [4 x HBR2 7777] 	 caps [features 0x103141f, p_encoding 0xd] 	        Sink   OUI:000-016-250 eD?gba [101-068-021-103-098-097] HW Version: 1    FW Version: 9.10
  2: 
  3: 
* 4: DDC Accessible: 00 ff ff ff ff ff ff 00 10 ac 47 41 4c 31 35 30 
  5: 

(1) is the built in display of the Macbook Pro (16 inch, 2019) (Intel 8-Core i9, AMD Radeon Pro 5500M 8 GB). Sink OUI:000-016-250 is Apple, Inc.
(4) is the first DisplayPort connection to the Dell and it's not showing DisplayPort info as it should, like (1) does.
The second DisplayPort connection doesn't appear at all.
There should be two DP 1.4 4 x HBR3 connections with the same Sink OUI for the Dell UP3218K.

You have bad DisplayPort cables, or the display is broken. Do you have a different Mac to test? Different cables? You need DisplayPort 1.4 (HBR3) cables at least.

Both DisplayPort cables need to be connected to separate Thunderbolt ports of the Mac. They cannot be connected to the same Thunderbolt adapter or hub or dock. The MacBook Pro has four Thunderbolt ports try each of them.

I don't think the goal is to get 8K60 on your Intel Mac so I'm not going to ask you to install OCLP with my Lilu/WhateverGreen forks.
We are just using the Intel Mac to check the DisplayPort connections to the display.

[rat10]

@jamesdh Thanks for pinging me! I hadn't forgotten or missed @joevt comment, I just didn't have the nerve to go at it again...
@joevt Thank you for the explanation (and of course for the AllRez tool!)

I did plug in the old Intel Mac again and switched cables (I have two pairs of new DP 1.4 cables) and ports (the old Intel Mac has 4). Strangely enough on the Intel Mac the Display was showing up twice, with 4K resolution each, whenever two cables were connected. And DP 2 seemed to work again. However no 8k resolution.
AllRez returned connection readings like the above, but also with two readings, sometimes on 3 and 4, sometimes on 4 and 5, always the same hex code:

* 1: [DP 1.2 4 x HBR2] 	 Status: [4 x HBR2 7777] 	 caps [features 0x103141f, p_encoding 0xd] 	        Sink   OUI:000-016-250 eD?gba [101-068-021-103-098-097] HW Version: 1    FW Version: 9.10
  2: 
* 3: DDC Accessible: 00 ff ff ff ff ff ff 00 10 ac 47 41 4c 31 35 30 
* 4: DDC Accessible: 00 ff ff ff ff ff ff 00 10 ac 47 41 4c 31 35 30 
  5: 

After a lot of back and forth I connected to the new M4 Max again, and see, on the M4 Max Mac I've got 8K resolution again.
I don't really know what to make of that. I was ready to hassle with the dealer to take the damn thing back. Now of course I'll probably just have to pray that it won't break again. I guess it's the DP 2 port, maybe only a mechanical problem. But since Dell doesn't repair their monitors... :-( And I'll never run it in portrait mode again.
Oh, and the monitor is connected with a pair of DP1.4 - USB-C cables are to a Kensington Thunderbolt 5 hub, and that again with one TB5 cable to the Mac, running the display at 8K - that is a really nice setup (as long as it works ;)

[Acinity]

Hi. I'm late to the party but I do plan to buy this Dell monitor soon. Is it still working out for you? And also, is the content displayed smaller than it should? Someone told me that macOS doesn't support scalling large enough to make the user interface not seem too small. Thanks

[rat10]

Hi. I'm late to the party but I do plan to buy this Dell monitor soon.

I'm not sure I'd buy it again. After all the stories I heard it seems like you should calculate for it to amortize in the 3 years that Dell will support you. Also within those 3 years it seems they will replace it only 2 times. And there is no repair by Dell afterwards. So essentially it seems like a very nice monitor, but only if you're lucky... I'm hoping for the LG 32U990A that has been announced in January.

Is it still working out for you?

Yes, it still is, fingers crossed. I'm not using it in portrait mode anymore and I try not to touch/move the cables.

And also, is the content displayed smaller than it should? Someone told me that macOS doesn't support scalling large enough to make the user interface not seem too small. Thanks

It can scale to smaller than Retina, and to much bigger as well. You should have no problems in that respect.

[Acinity]

Thanks for the quick reply. If you ever get a chance, it would be great if you can give me the scale you use. I would like a 1:1 scale if I'm gonna buy it lol. Kind of how my Dell 5k monitor does a 1:1 scale at 1440p. i don't mind going through the extra trouble. I'm a geek.

[rat10]

I'm currently running it at 6720 x 3780 @ 60Hz. I can run it at anything from 800 x 600 to 7680 x 4320 @ 60 Hz, and I can set those from the System Preferences Display pane.