Dell Thunderbolt Dock WD22TB4 User Guide

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Display bandwidth

External monitors require a certain amount of bandwidth to work properly. Monitors with higher resolution require more bandwidth.
  • DisplayPort High Bit Rate 2 (HBR2) is 5.4 Gbps maximum link rate per lane. With DP overhead, the effective data rate is 4.3 Gbps per lane.
  • DisplayPort High Bit Rate 3 (HBR3) is 8.1 Gbps maximum link rate per lane. With DP overhead, the effective data rate is 6.5 Gbps per lane.
Table 1. Display bandwidthThe following table provides the display bandwidth specifications of your docking station:
Resolution Minimum bandwidth required

1 x FHD (1920 x 1080) display @60 Hz

3.2 Gbps

1 x QHD (2560 x 1440) display @60 Hz

5.6 Gbps

1 x 4K (3840 x 2160) display @30 Hz

6.2 Gbps

1 x 4K (3840 x 2160) display @60 Hz

12.5 Gbps

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