The Adaptec 2271700-R RAID 6405E Controller Card possesses a reliable SAS/SATA III 6Gb/s interface to comply with the latest and most efficient hard drives. Let your computer accommodate up to four hard drives through the 4x ports. Experience a solid performance between the controller card and your computer"s motherboard with the PCI-Express 2.0 interface. Data processed in your computer will achieve optimum data buffering thanks to the 128MB DDR2 cache of the controller card for seamless operations.