cancel
Showing results for 
Search instead for 
Did you mean: 

Help with Multi Monitor Setup PG32UDCP

Arbitrex
Level 7

Hey everyone!

Need some help with my setup! I have been running an Asus 27" OLED 2k 240hz monitor as my main gaming monitor, and 3 27" Acer 1080p work monitors with my Strix 4090. I have not had any issues running this setup for years, and yes i use them all for work lol.

I just purchased over the weekend the PG32UCDP 4k monitor and I can only get 2 of the 3 27" Acers to work.

If i disable DSC on the Asus OSD, I can get all of them to work however I am stuck in 120hz.

Any suggestions would be much appreciated!

192 Views
7 REPLIES 7

Aureliannn_ROG
Customer Service Agent

Hi @Arbitrex ,

To better assist you with this issue, we would like to confirm the following:

1. Display models: Please provide the exact model, resolution, and refresh rate of the four displays you are currently connecting. For example:

  • First display: ROG PG32UCDP (2K 360Hz)
  • Second display: ...
  • Third display: ...
  • Fourth display: ...

2. Connection test:

  • If you connect only three ACER displays, can they all be displayed normally?
  • When you connect the PG32UCDP, can only two ACER and one ASUS display be displayed, and the other ACER cannot be displayed?
  • If you connect only one ASUS and one ACER, can both be displayed normally?

3. System detection: Please open the "Display settings" in your Windows system and take a screenshot showing the number of displays detected by the system.

Providing this information will help us analyze the problem more in-depth. Thank you.

Please note that response times may be delayed due to upcoming regional holidays. For urgent inquiries, please contact your local service center. Thank you for your patience.

Hi there. Sure thing and thank you so much for reaching out. 

I also want to mention that I am running a ROG Strix 4090, Windows 11, AMD Ryzen 7 9800X3D and a ROG X870E-E, EVGA 1200w Platinum Power Supply.

1.

  • First Display: ROG PG32UCDP (4k 240hz) - Connected by DP
  • Second Display: Acer 27" KGB271U (2k 60hz) Also tried turning down to (1080 60hz) as well. -Connected by DP
  • Third Display: Acer 27" KA272 (1080p 60hz) -Connected by HDMI
  • Fourth Display: Acer 27" KA272 (1080p 60hz) -Connected by HDMI

2.

  • All Acers connect and display normally with connected without the Asus monitor
  • Yes only The Asus and 2 of the Acer's are able to display without disabling DSC on Asus monitor.
  • See attached screenshot -1. I cannot enable the 4th display without disabling DSC on Asus monitor.
  • See attached screenshot -2. I have all 4 working and enabled but only with DSC off on Asus monitor.

The issue is in screenshot -3,  I can only run the PG32 in 120hz, which I should be able to run 4k 240hz. One more mention. After disabling DSC in the Asus Monitor settings in order to be able to enabled the other 3 monitors, I even set the Asus to 1080p and still could only get 120hz.

3.

  • Screenshot 4 is the windows settings.

I sincerely appreciate your time and help, this is a work setup for me as well as gaming so I really hope I can resolve this.

 

1- Multiple Display Settings.jpgWith DSC Turned Off on AsusWith DSC Turned Off on AsusAsus Resolution Available with DSC OffAsus Resolution Available with DSC Off4- Windows Display Settings.jpg

 

 

 

https://nvidia.custhelp.com/app/answers/detail/a_id/5338/kw/DSC

Display Stream Compression (DSC) is a visually lossless compression technique developed by the Video Electronics Standards Association (VESA) for use with displays to achieve larger resolutions at higher refresh rates.  DSC is used in both DisplayPort 1.4+ and HDMI 2.1 standards. 
 
Using a monitor/display with DSC support over DisplayPort 1.4+:
Display Stream Compression over DisplayPort 1.4+ is supported on Turing class (GeForce RTX 20-series/GeForce GTX 16-series) and higher GPUs. 
 
Using a monitor/display with DSC support over HDMI 2.1:
Display Stream Compression over HDMI 2.1 is supported on Ampere class (GeForce RTX 30-series) GPUs.     
 
Additional Display Stream Compression Information:
  • While you may use a an older GPU (eg. GeForce GTX 10-series) with a display that supports Display Stream Compression over DisplayPort 1.4+/HDMI 2.1, you may not be able to select the highest resolution or refresh rate supported by the display.       
  • When a display is connected to the GPU and is set to DSC mode, the GPU may use two internal heads to drive the display when the pixel rate needed to drive the display mode exceeds the GPU’s single head limit. This may affect your display topology when using multiple monitors.  For example if two displays with support for DSC are connected to a single GeForce GPU, all 4 internal heads will be utilized and you will not be able to use a third monitor with the GPU at the same time.
  • If the GPU detects that a display supports DSC, DSC mode will be enabled automatically.  Some displays may allow you to disable DSC by changing the communication link from the displays internal settings (eg. changing the DisplayPort mode from Displayport 1.4 to DisplayPort 1.2)     
  • To determine if your PC monitor, notebook display or TV supports Display Stream Compression, please refer to your display manufacturer.  

Thank you for the explanation but the three Acer monitors are very basic and do not support DSC. Only my Asus 32 supports DSC and the port next to the DP is empty. I also am running a Strix 4090.

The Acer's show DDC in their setting menu but I dont know if thats the same. I have checked their Spec website as well.

Bigbrotherjx
Level 8

I think what the Nvidia help page is saying is that you can connect a maximum of 4 monitors to a card. However, if a monitor is using DSC, it uses the "capacity" of 2 monitors, leaving you with only 2 remaining connections possible. This is why you cannot have all 4 monitors connected when DSC is enabled on your new ASUS monitor.

Ok after checking the 4090 page, it does look like 4 is the max amount of support displays. That makes perfect sense!

But, do i have to run DSC to get 4k 240hz on my main Asus?

Bigbrotherjx
Level 8

I believe you will need DSC as neither HDMI 2.1 nor DP 1.4 will have enough bandwidth without it.