HighPoint RocketU Quad USB 3.0 PCI-Express 2.0 x4 RAID HBA for Mac Max Performance up to 20Gb/s Optimized for external USB SSD's, hard drives and drive enclosures PCI-Express Gen 2 x4 4 USB 3.0 Super Speed Speed Type-A ports (5Gb/s per port) Supports up to 4 external USB HDD/SSD 4 USB 3.0 Super Speed Speed Type-A ports (5Gb/s per port) PCI-Express Gen 2 x4 Supports up to 4 external USB HDD/SSD Optimized for external USB SSD's, hard drives and drive enclosures Max Performance up to 20Gb/s Supports RAID 0, 1 and JBOD Backwards compatible with USB 2.0 & 1.1 Supports OS X 10.5 - 10.7.4