Add 4 USB (Universal Serial Bus) 3.0 ports (2 external, 2 internal motherboard header) to a computer through a PCI Express slot. The PEXUSB3S2E2I 4-Port PCI Express USB (Universal Serial Bus) 3.0 Controller Card adds 2 external USB (Universal Serial Bus) 3.0 ports & 2 internal USB (Universal Serial Bus) 3.0 motherboard headers to a PCI Express-enabled computer system, with support for Super Speed USB (Universal Serial Bus) 3.0 data transfer rates up to 5 Gbps as well as backward compatibility with devices that rely on previous USB (Universal Serial Bus) standards (USB 2.0, 1.x).