Dell UD22 - Understanding Display Bandwidth; Display Resolution and Refresh Rate

3. Under the Multiplay displays section, modify display conguration as needed.
Display Bandwidth
• DisplayPort High Bit Rate 2 (HBR2) is DP 1.2 (5.4 Gbps maximum link rate per lane). With DP overhead and UD22 MST display
bandwidth, the eective data rate is 4.25Gbps per lane.
• DisplayPort High Bit Rate 3 (HBR3) is DP 1.4 (8.1 Gbps maximum link rate per lane). With DP overhead and UD22 MST display
bandwidth, the eective data rate is 6.25Gbps per lane.
• DisplayPort High Bit Rate 3 (HBR3) with DSC (Display Stream Compression) compression 1:2.1 ratio or higher is DP 1.4 (8.1
Gbpsx2.1=17.02Gbps
maximum link rate per lane). With DP overhead and UD22 MST display bandwidth, the eective data rate is 13.125Gbps per lane.
Display Resolution Table
Table 2. Display bandwidth
Table 3. Dell Universal Dock UD22 display resolution and refresh rate table (When UD22 dock driver is installed in computer)
Resolution
Minimum bandwidth required
(Computer supported)
CVT CVT-RB CVT-RB v2
FHD (1920 × 1080) @60 Hz x1 4.15 3.33 3.2
FHD (1920 × 1080) @60 Hz x2 8.3 6.66 6.4
QHD (2560 × 1440) @60 Hz x1 7.4 9 5.8 5.63
QHD (2560 × 1440) @60 Hz x2 14.98 11.6 11.26
4K (3840 × 2160) @30 Hz x1 8.13 6.31 6.18
4K (3840 × 2160) @30 Hz x2 16.26 12.62 12.36
4K (3840 × 2160) @60 Hz x1 17.1 12.8 12.54
4K (3840 × 2160) @60 Hz x2 34.2 25.6 25.08
Setup of External Monitors 17