Cable Matters USB-C to 4K 60Hz DisplayPort Multiport Adapter with 2x USB, Ethernet, and Power Delivery (Thunderbolt 3 Port Compatible) in Black

Most USB-C dongles use the DisplayPort alt-mode of the USB-C specification to handle the display outputs, but usually use internal converters to HDMI. Unfortunately, they only wire the pins for HDMI 1.4, which can only run 4k displays at 30 Hz. This is due to the limited pins in a USB-C cable. If you want to run DisplayPort or HDMI 2.0, then you can't have USB 3.0 (unless you use thunderbolt). I needed to run this on a Lenovo Thinkpad with only 1 USB-C port, so having USB-PD passthrough was a much so that I could charge while having a monitor plugged in. This is the only dongle I found, with DP, and USB-PD passthrough. The 2 USB 2.0 ports are an added bonus, and work for a mice and keyboard. The Ethernet also runs from the USB bus, and is a 100Mbit one. It is picked up by the RTL Linux Kernel driver (though sometimes it disconnects after you suspend/resume the laptop). Overall, it works for my use!

Works just as intended. Works at 1440p 240hz no problem, power delivery is good and usbs are good, ethernet is 100Mib

Due to the fact that this dock only has USB 2.0 ports, it means more bandwidth can be allocated to the video, so this is the first dock that I have been able to find which will support the full capabilities of my monitor (Asus Rog XG349C). It has been working flawlessly with both my Macbook Air M1 as well as my Razer Blade 14 (3070 model). The only downside is the form factor is a bit ugly on the desk. I have tried extending it with USB C cables so I can mount it under my desk and only have the one cable above my desk, but often see intermittent blanking of the display with any 10GBps cables I have used. More recently have tried a more extensive USB 4 cable and while it's still infrequent, the problem has been coming back every now and then. Without the extension cable in the equation, it never happens with the dock plugged in directly however.

I just wanted to thank Cable Matters customer service for directing me to this product. I've tried All Dell, Lenovo, Pluggable, etc. TB4 and USB4 docks to get my AMD 6800U Laptop to work with the docking station, but none of them worked. The laptop has USB4 and USB3.2 with USB-C. I'm happy to report that this dock or adapter works with Neo G9 monitor at full 240hz without any problems. This means this dock supports 4lane DP with DSC. Also, the Realtek LAN adapter is showing its GBE, not 100mbit. Device Manager shows Realtek 8152 which is GBE. It might be bottlenecked by the USB 2.0 throughput but it has the hardware to saturate the USB 2.0. Lastly, Power Deliver works with 65w charger that Laptop came with. My next purchase was going to be Caldigit to try but this does everything I need. Highly recommend!

Used on a M4 Macbook Pro connected to a 4k 144hz display with no issues at all. USB 2.0 is fine for pheripherals. Wish the connectors were all on one side to allow easier cable management.