*Maximum values depend on the laptop, operating system, power supply and simultaneous display arrangement. They are not universal promises.
| What matters |  Plugable UD-3900PDZ | Choose a dock above | Choose a dock above |
|---|
| Laptop connection | USB-C with DisplayPort Alt Mode and PD | — | — |
| Display technology | displaylink | — | — |
| Maximum displays* | 3 | — | — |
| Power to laptop (W)* | 100 | — | — |
| HDMI sockets | 3 | — | — |
| DisplayPort sockets | 0 | — | — |
| Display conditions | 1 × 4K30 native Alt Mode; 2 × 1080p60 DisplayLink | — | — |
| Mac requirements | DisplayLink installation required; Alt Mode needed for the native output | — | — |
| Windows requirements | Windows with DisplayLink software; native channel also requires DP Alt Mode | — | — |
| Wired network | Gigabit Ethernet | — | — |
| USB peripherals | 6 USB-A, 5Gbps | — | — |
| Before buying | Not three 4K outputs DisplayLink outputs are unsuitable for protected streaming and demanding gaming | — | — |
| Current listing | Check on Amazon ↗ | | |