The ExpressSAS® H644 provides high-speed 6Gb/s performance at 600MB/s per port. By utilizing a serial, point-to-point architecture, in addition to PCI Express 2.0 bus technology, ExpressSAS® 6Gb/s HBAs are engineered for demanding IT and digital media applications. The ExpressSAS® H644 features four internal ports, four external ports and allows connections to 1024 end-point devices.