The PEXUSB3S23 2-Port PCI Express USB (Universal Serial Bus) 3.0 Card lets you add two USB (Universal Serial Bus) 3.0 ports to any PCI Express-enabled computer system. The USB (Universal Serial Bus) card requires SATA power for functionality, & delivers 900m A of power per port to USB (Universal Serial Bus) 3.0 bus-powered devices 500m A