5Gb/s per port * PCI Express 2.0 x4 * Quad-Port: Four USB 3.0 ports with type A connectors for easy data access * 20Gb/s transfer bandwidth * 2 ounce (oz) copper PCB layer for robust transfer performance and improved energy efficiency * Backwards compatible with USB 2.0 & 1.1 * Compliant with xHCI (Extensible Host Controller Interface) Specification * Optimized for external USB drives and drive enclosures