I Own a Gigabyte 1660 GPU. I want to have a 2 monitor setup, with one monitor at 60hz and the other at 144hz. My 60hz monitor, however, only has HDMI Ports, and my GPU only has one HDMI port.
Connect the 60 Hz monitor to HDMI, 144 Hz to Displayport. That will indeed give you signal to both of them. Otherwise it'd be pretty difficult to have multi-monitor setups.