Add two USB (Universal Serial Bus) 3.0 ports to your desktop computer through a PCI Express slot. 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, with an optional SATA power connector to connect to your system power supply & deliver up to 900m A of power per port to USB (Universal Serial Bus) 3.0 bus-powered devices (500m A for USB (Universal Serial Bus) 2.0).