The HP Smart Array P411 is HP's external connect only, PCI Express (PCIe) 2.0 Serial Attached SCSI (SAS) Raid controller. The low profile, half height card has 8 ports & utilizes DDR2-800 memory. The P411 is ideal for RAID 0, 1, 1+0, 5, 5+0 & can be upgraded with a minimum of 256MB cache module, battery kit & smart array advanced pack license key for Raid 6 (ADG) & 6+0.