I have not tested this but I’m not certain as the adapter I have is HDMI (is not 2.1) but display port is 1.4 @144hz. So, an adapter may work.

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Cable Matters4-in-1 Portable USB C Hub HDMI 4K 60Hz 100W Charging for iPhone 15, 10Gbps Foldable USB-C Digital AV Multiport Adapter, USB C HDMI Hub Compatible with Thunderbolt 4 for MacBook, Dell XPS

Q: Will the usb-c port on the dock support video (through the usb-c port, not the HDMI one)? I have a dell portable monitor with a USB-C to USB-C cable.

It does. It's USB-C 3.2 , that supports video and data pass-through. The problem here is your cable. Not all USB-C cables are compatible. As long as your cable supports video and data pass-through it will work.

Q: Will it do 1440p resolution at 144hz ?

RESPONSE FROM MANUFACTURER - CABLE MATTERS: Yes, this 4-in-1 Portable USB C Hub works for 2560x1440P at 144Hz. Please feel free to let us know if you have any further questions by contacting us through Amazon's messaging center. Open the product page, click on "Sold by Cable Matters" and then "Ask a Question”. Cable Matters Support Team

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产品编号: 540375183

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描述

Cable Matters4-in-1 Portable USB C Hub HDMI 4K 60Hz 100W Charging for iPhone 15, 10Gbps Foldable USB-C Digital AV Multiport Adapter, USB C HDMI Hub Compatible with Thunderbolt 4 for MacBook, Dell XPS