Unsolved
1 Rookie
•
1 Message
0
4951
August 28th, 2022 14:00
U2723QE, two daisy chain, no 4K 30Hz issue
Hi team,
I have two DELL U2723QE that are working wonderfully for the most part. However I am having some issues getting 4K 60Hz sometimes from both U2723QE when daisy chained together. I have them set up as follows:
Mac setup (work):
USB-C from Mac to #1 U2723QE MST on, and another USB-C to #2 U2723QE. This works great I get 4K 60hz, looks wonderful.
PC setup (Windows 10):
PC DP out to #1 U2723QE DP in MST on. #1 U2723QE DP out to #2 U2723QE DP in. Exactly as described here in the manual page 40 =
I can get both U2723QE to display picture in 4K with this setup. However, it is only in 30Hz in one or both of the U2723QE. I go into Windows settings -> Display -> Advanced display settings but the only option is 30Hz (or 29.981hz). After plugging and unplugging every cable I can sometimes get one to be 60Hz but not both as desired.
If I just use an HDMI cable from #2 U2723QE to my PC then I can get 4K 60Hz in both U2723QE but this of course less than ideal having to run a second cable and makes some situations for picture in picture not work very well.
Maybe Relevant PC info:
Processor AMD Ryzen 7 3700X 8-Core Processor 3.59 GHz
Installed RAM 32.0 GB
Graphics card GTX 660
Edition Windows 10 Home
Version 21H2
OS build 19044.1889
innomerphey
1 Message
0
February 12th, 2023 13:00
Your video card only supports DisplayPort 1.2, so you can only connect one 4K monitor at 60Hz.
NinaMaya
4 Posts
0
February 16th, 2023 06:00
I have the same problem with an NVIDIA P4000 that supports DP 1.4, in a ThinkPad P71. I cannot use two 4K monitors with daisy chaining. But having the DELL via the USB-C and another one (Samsung) via separate DisplayPort cable totally works fine. I will also have to set the USB-C priority to "High Resolution" to get even the single Dell to be 60Hz in 4K. So I have the Dell via USB-C and the Samsung via Displayport as the only working setup. I always thought that it had to do with what the USB-C (in my cases also supports Thunderbolt) can handle and that it just doesn't have the bandwidth to support two 4K displays. I wonder if this is true or if just my USB-C port doesn't provide the bandwidth?