Dual USB 3.0 port expansion from a USB 3.0 19pin header What it is: This adapter card enables two USB 3.0 ports to be driven from a single USB 3.0 19pin header on a PCIe card or motherboard. Compatibility: Fits all motherboards with a USB 3.0 (19pin) header. Flexible orientation: USB 3.0 ports can be positioned on the left and right sides of the motherboard, and the card can be used in either direction to avoid transmission obstruction. Performance and compatibility: Compliant with USB 3.0 SuperSpeed (5 Gbps), and backward compatible with USB 2.0 HiSpeed (480 Mbps) and USB 1.1 LowSpeed (1.5 Mbps). Benefits and practical advantages: Adds two USB 3.0 ports from one 19pin header, expanding internal connectivity. Port orientation options help accommodate tight or crowded motherboard layouts. Maintains full USB 3.0 performance while remaining compatible with older USB devices. Size and form factor: Compact adapter card designed to connect to standard USB 3.0 headers and integrate with typical motherboard layouts. Use scenarios: Scenario 1: You have a motherboard or PCIe card with a single USB 3.0 header but need two USB 3.0 ports for devices such as external drives or fast peripherals. Scenario 2: Your PC case or motherboard has limited clearance or routing space; orient the ports to the left or right to prevent cable interference. Scenario 3: You want to support existing USB 3.0, USB 2.0, and USB 1.1 devices without changing existing peripherals or drivers, benefiting from backward compatibility. Applications: Internal USB 3.0 expansion for desktops and workstations. Reconfiguring USB port placement to optimize cable routing and airflow. Scenarios where maintaining compatibility with older USB standards is important while leveraging USB 3.0 speeds.