Using a Dell Inspiron 3670, Windows 10, with this card factory installed.
Have (2) monitors connected and would like to add a 3rd but I have no available VGA ,DVI, or HDMI connections on the computer. I have (3) extra USB ports but my understanding this connection cannot be used?
On this low-end desktop, dell only provided vga and hdmi outputs. The processor supports 3 monitors, but dell's motherboard only gives you two.
The use of adapters may help you achieve what you want, but is not supported.
Personally, I would purchase a graphics card (the UHD 630 is not a card, but built into the processor), and have 3 or more monitors.
You may want to contact Dell for support.