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Donsell

macrumors member
Feb 19, 2021
67
51
I just found this page:

The Mac supports Multi-Stream Transport (MST, multiple displays on one cable) with a maximum of TWO modest-sized displays ONLY on Genuine ThunderBolt Cables connecting to a Genuine ThunderBolt device [dock or display] as the first device.

So, not support the Dell U3223QE with macOS.
Thank you for the clarification. That was my understanding also.
 

joevt

macrumors 604
Jun 21, 2012
6,974
4,262
I just found this page:

The Mac supports Multi-Stream Transport (MST, multiple displays on one cable) with a maximum of TWO modest-sized displays ONLY on Genuine ThunderBolt Cables connecting to a Genuine ThunderBolt device [dock or display] as the first device.

So, not support the Dell U3223QE with macOS.
Thunderbolt doesn't use MST. The Thunderbolt controller in a Mac gets two completely separate 4 lane DisplayPort connections from the GPU. The two DisplayPort signals are tunnelled over Thunderbolt to Thunderbolt controllers in downstream Thunderbolt docks or Thunderbolt displays where the tunnelled DisplayPort data is converted back to DisplayPort. At no point in the chain is MST required. The signals can both be SST.

In Windows or Linux, the signals can be MST or SST depending on the downstream DisplayPort device so in theory you could connect a dozen displays using two separate MST hubs connected to a Thunderbolt dock or hub. I don't think any GPU can do a dozen displays so you would need to be able to connect two GPUs to the host Thunderbolt controller which is possible when the Thunderbolt controller has accessible DisplayPort inputs such as in some PC motherboards or with Thunderbolt add-in cards.
 

Dentifrice

macrumors 6502
Aug 27, 2008
448
85
I got my u2723qe. I really like the picture quality for the price. I’m really happy for lightroom.

My biggest disappointment is the lack of MST support. I’ll need to use a second cable for 2nd monitor… not a deal breaker though
 

torontotim

macrumors 6502
Jul 29, 2019
266
468
Got my 2nd U2723QE today (ordered one with 5% cashback on Rakuten then they increased it to 15% so I ordered another and am returning the first for the extra 10% off).

Very nice display - I'm actually running it at the 1080p scaling and have found it to be plenty of real estate when I am also using my MBP display. I even have my Lenovo M14 plugged into the other side for fun.

Definitely nice blacks when running HDR demos on YouTube - I haven't dug into the settings much, just bumped the brightness up to 80%.
 

Quu

macrumors 68040
Apr 2, 2007
3,443
6,876
I got my u2723qe. I really like the picture quality for the price. I’m really happy for lightroom.

My biggest disappointment is the lack of MST support. I’ll need to use a second cable for 2nd monitor… not a deal breaker though

Get a Thunderbolt dock. Nice single cable solution. I use a USB-C Pro dock from Caldigit (it's Thunderbolt 3) and it provides 2 x 4K 60Hz outputs. Works perfect with my Apple Silicon equipped 16" MacBook Pro :)
 
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Dentifrice

macrumors 6502
Aug 27, 2008
448
85
Get a Thunderbolt dock. Nice single cable solution. I use a USB-C Pro dock from Caldigit (it's Thunderbolt 3) and it provides 2 x 4K 60Hz outputs. Works perfect with my Apple Silicon equipped 16" MacBook Pro :)
do you have the exact model?
 

torontotim

macrumors 6502
Jul 29, 2019
266
468
I have an older Targus TB3 dock that I picked up 2nd hand that has worked great with my MacBook, although I haven't tried it on multiple displays. Just 4K 60hz over DisplayPort. Single TB cable from the dock to the MacBook provides gigabit ethernet, display and all the USB junk I can plug into it.


Screen Shot 2022-05-19 at 8.33.10 PM.png


In theory the Dell can replace this, but then I have to route the any cables that currently go to the dock up my monitor arm to the display. Currently it's just the power and display cable up that arm, and a TB cable up the other arm to my laptop tray.

So we'll see how the cable management goes once I mount the Dell on the arm and route some cables. I'm sure it will be fine and better than having the dock sitting on my desk.
 
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Dentifrice

macrumors 6502
Aug 27, 2008
448
85
out of curiosity, for people who have the monitor, which HDR settings did you set?

The choices are : Desktop, Movie HDR, Game HDR, DisplayHDR 400 and OFF

I'm not sure what I should choose.
 

Defever

macrumors member
Mar 16, 2022
32
3
Can anyone tell me which setting I have to choose with the joystick in this monitor?
When I selected USBC-90W auto I had no picture. The USB-C cable was connected to port 5: USBC 90W.
TIA
 

Degrader

macrumors member
Feb 19, 2022
61
24
out of curiosity, for people who have the monitor, which HDR settings did you set?

The choices are : Desktop, Movie HDR, Game HDR, DisplayHDR 400 and OFF

I'm not sure what I should choose.
The best setting for playing HDR content is "DisplayHDR 400", this setting provides a calibrated HDR color reproduction. However it is good to know that the peak brightness is only around the 450 nits (as it is a DisplayHDR 400 monitor), so highlights won't be as detailed as on higher tier HDR monitors like DisplayHDR 600/1000/1400. I think that's what RabidMacFan means.
 
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Defever

macrumors member
Mar 16, 2022
32
3
Can someone tell me if the USB-C cable provided with these Dell monitors is compatible with the Mac Studio? The screen remained black.
 

Spacegray

macrumors regular
Apr 10, 2016
210
173
Can someone tell me if the USB-C cable provided with these Dell monitors is compatible with the Mac Studio? The screen remained black.
Works fine with my MBA M1, so it should also work with the Studio. It's just an ordinary USB-C interface.
 

Dentifrice

macrumors 6502
Aug 27, 2008
448
85
Noob question guys. I tried gaming with this monitor on my PC.

But my PC isn’t powerful enough to game at 4K.

So I tried playing at 1080p and 1440p and to my surprise, the picture quality was VERY good.

I remember when not using the native resolution on my old cheap monitors, it would end up in a blurry picture.

But with this Dell, wow, * almost * as good as native res.

Is there a reason?
 

sikosis

macrumors newbie
Sep 22, 2010
7
2
Just got one of those U2723QE and the issue we're seeing is the ethernet port when disconnected, the next time you connect to the monitor, you won't have an active network connection. You need to unplug the cable from the monitor to refresh it. I've seen with Windows users they can update the Realtek driver and that fixes it for them but macOS users don't have that option.

Any ideas?

 

VanVanWang

macrumors member
Apr 30, 2022
30
18
Just got one of those U2723QE and the issue we're seeing is the ethernet port when disconnected, the next time you connect to the monitor, you won't have an active network connection. You need to unplug the cable from the monitor to refresh it. I've seen with Windows users they can update the Realtek driver and that fixes it for them but macOS users don't have that option.

Any ideas?

No driver needed both win/mac, check your eth cable.
 

VanVanWang

macrumors member
Apr 30, 2022
30
18
The default setting for usb-c prioritization is “high resolution”, that means the data transfer protocol limited in usb2. When you plugin the C cable you will be noticed by the screen popup message. Switch to “high data speed”, you will get usb 3.1 10gpbs speed for all USB-A/RJ45 Eth ports.
 

Dentifrice

macrumors 6502
Aug 27, 2008
448
85
The default setting for usb-c prioritization is “high resolution”, that means the data transfer protocol limited in usb2. When you plugin the C cable you will be noticed by the screen popup message. Switch to “high data speed”, you will get usb 3.1 10gpbs speed for all USB-A/RJ45 Eth ports.
But I suppose you lose performance for your monitors? Maybe you can’t do 4K/60hz?

The documentation says nothing about it when you change this setting. If it exists it must limit something
 

joevt

macrumors 604
Jun 21, 2012
6,974
4,262
But I suppose you lose performance for your monitors? Maybe you can’t do 4K/60hz?

The documentation says nothing about it when you change this setting. If it exists it must limit something
It limits you to two lanes of DisplayPort. If it's HBR3, then you can still do 4K60Hz but only at 8bpc unless DSC works.
 
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