USB-C devices rely on the DisplayPort protocol for display over USB-C, allowing DisplayPort, HDMI, and other display options to be displayed over USB-C. Devices can be DisplayPort 1.2 or DisplayPort 1.4.
DP 1.2 signal has a total of 4 Lanes, each lane supports 5.4Gbps. With a total of 4 lanes, it supports 4K 60Hz video, while with 2 lanes, it can only support up to 4K 30Hz.
DP 1.4 signal also has a total of 4 lanes, each lane is capable of running 8.1Gbps. It supports 8K with a total of 4 lanes, while with 2 lanes, it can support 4K 60Hz.
When the HyperDrive Gen2 USB-C Hub is connected to a computer, it will occupy 2 lanes for USB 3.2 signal to support USB-A/LAN/card slots, leaving out 2 lanes for video. If the computer has a DP 1.2 USB-C port, the 2 lanes can only support up to 4K 30Hz. If it is a DP 1.4 USB-C port, the 2 lanes can deliver 4K60Hz.
Why is it that when I use a USB-C to HDMI/DisplayPort adapter, I can get 4K60Hz?
The adapter uses all 4 lanes for video. However, an adapter with multiple ports will only deliver 4K 30Hz under the condition of USB-C DP 1.2.
How do I find out if my device supports 4K60Hz?
These Apple devices support DisplayPort 1.4 and are capable of 4K60Hz
- iPad Pro 11-inch (2018 and 2020)
- iPad Pro 12.9-inch (3rd & 4th Generation)
- MacBook Pro (15-inch, 2017 and later)
- MacBook Pro (16-inch, 2019 and later)
- iMac (Retina 5K, 27-inch, 2017 and later)
- Mac (Retina 4K, 21.5-inch, 2017 and later)
- iMac Pro (2018)
For Windows devices, the best way to find out is to reach out to the manufacturer of your device. They can provide detail based on the serial number of your device, as sometimes, even different versions of the same device can have different specs.