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Affected Products: Dell Pro Dock - WD25 Dell Pro Smart Dock - SD25 Dell Pro Thunderbolt 4 Dock - WD25TB4 Dell Pro Thunderbolt 4 Smart Dock - SD25TB4 Dell Pro Thunderbolt 5 Dock - WD25TB5 Dell Pro Thunderbolt 5 Smart Dock - SD25TB5 Dell Monitor U3223QE Dell Monitor U3223QZ Dell Monitor U2723QE Users may observe that the monitor is displaying at a lower resolution (for example, 4K at 30Hz) or not achieving the smoothness expected from a 60Hz refresh rate. This issue may lead to: Decreased display quality Reduced sharpness Less fluid motion on the screen
When MST is enabled, the available bandwidth is not enough to support 4K at 60Hz with 8-bit color depth, which leads to the display issue.
This is working as designed. Go to the monitor's On-Screen Display (OSD) menu and turn off the Multi-Stream Transport (MST) option. Note: Disabling MST in the monitor OSD also disables DisplayPort daisy chaining. If daisy chaining is required or was previously in use, you should instead connect additional monitors using separate video output ports on the docking station. This approach helps avoid bandwidth limitations and allows achieving 4K at 60Hz without relying on MST.
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