High Point Second Generation Quad USB 3.0 Port PCI-Express 2.0 x 4 HBA for Mac Pro RocketU 1144BM 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 Driver support for mac OS X 10.5 and newer