ATTO ExpressSAS H644


Low-Profile 4-Internal/4-External Port 6Gb/s SAS/SATA PCIe 2.0 Host Bus Adapter.

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.

ExpressSAS® 6Gb/s Host Bus Adapters (HBAs) deliver the fastest available connection to SAS or SATA tape or disk storage. With a full range of port configurations and driver support, easy-to-use features, extensive industry qualifications and support for up to 2,048 end devices, ATTO has a 6Gb/s SAS HBA design to meet your performance needs. 


  • Data Rate: 6Gb/s.
  • Transfer Rate: 4800 MB/s. 
  • Ports: 4 Int / 4 Ext. 
  • Bus Type: PCIe 2.0.