How USB-C Hubs Work
A USB-C hub expands the connectivity of a device by routing different types of connections through a single USB-C port. Depending on the hub and host device, this connection can carry data, video, and power.
However, not every USB-C port supports all these functions. The capabilities of the connected device determine which hub features are available.
Understanding USB-C Display Output
USB-C video output commonly uses DisplayPort Alternate Mode (DP Alt Mode), which allows a USB-C connection to transmit video to external displays.
The number of screens a hub can support depends on the host device's graphics hardware and display capabilities. Some laptops support multiple independent displays, while others have limitations.
Important: Mac computers may have different external display limitations depending on the model. DisplayPort MST support on Windows does not translate directly to independent extended displays on macOS.
What Is USB-C Power Delivery Pass-Through?
Power Delivery pass-through allows a hub to receive power from an external USB-C charger and pass available power to the connected laptop.
The 100W rating refers to the hub's supported PD input, not necessarily the power delivered to the laptop. Some power is used by the hub and its connected peripherals. Actual charging output depends on the charger and host device.
USB 3.0 vs Actual Transfer Speed
USB 3.0 has a theoretical maximum data transfer rate of 5Gbps. This is the interface's signalling rate, not a guaranteed file transfer speed.
Actual performance depends on the connected storage device, cable, file type, and other hardware limitations.
USB-C Compatibility: What to Check
Before purchasing a multiport hub, check the USB-C port specifications of your laptop, tablet, or smartphone.
- Display support: Look for DisplayPort Alt Mode or compatible video output.
- Charging support: Check whether the device accepts USB-C Power Delivery.
- Multiple monitors: Check the maximum number of external displays supported by the device.
- Operating system: Some advanced display functions may work differently across Windows, macOS, and Linux.