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Video / display outputs can be sent out via USB-C ports, that’s fully supported by the USB-C spec. As long as the connected device also supports USB DisplayPort Alt Mode. Also, you can literally take a DisplayPort expansion card out of the side of your Framework, and plug it into the back / GPU USB-C port instead, it’s a DP Alt Mode card. But normally you would use a USB-C to DisplayPort Alt Mode cable if you need a DisplayPort plug, only because that’s cleaner and safer than an expansion card hanging out of the back.