Internal USB ports on the motherboard
Internal USB ports on the motherboard
A single USB3 connector with 19 pins that supplies power to two regular USB3 ports, such as front I/O interfaces
One header on the motherboard, featuring two rows of pins. Each pin set holds the data for a USB 3.1 Gen 1 connector, allowing two USB 3.1 Gen 1 ports. Connect the cable from the case (if it has dual front USB 3 ports) or purchase a separate bracket with two USB 3 ports—USB 3.1 Gen 1 functions identically to USB 3.0. Examples: https://www.ebay.com/itm/50cm-20-Pin-Hea...Bracket-N3 and https://www.ebay.com/itm/USB-3-0-Back-Pa...-Port-S3J6
Usually a USB 3.1 cable has 20 pins. Connecting two may not significantly impact speed, though it depends on the setup. The link mentioned 20 pins, while your motherboard port is listed as 19—this could be due to differences in pin configuration or compatibility.
USB 3.0 or 3.1 Gen1 uses either 8 or 9 pins (two ground wires are present, but one is sufficient). The motherboard header includes an extra pin for a KEY, preventing incorrect insertion. The header accommodates up to 20 pins, though one is missing, leaving 19. In the image, the left pins are shifted down by one. The top-left ID pin isn’t used but helps prevent other connectors from being inserted. Connecting two cables doesn’t change speed; it remains unaffected. Your system has several USB 3 controllers that work regardless of cable presence or device connections. USB 3 ports on the back will connect to a single controller, while the header links to another, so it won’t slow down the ports.