HPE SmartArray P421/1GB. Supported storage drive interfaces: SAS, Serial ATA, Host interface: PCI Express x8. RAID levels: 0, 1, 1+0, 5, 50, Data transfer rate: 6 Gbit/s, Internal memory: 1024 MB. Width: 145.3 mm, Depth: 190.5 mm, Height: 241.3 mm. PCI Card form factor: Half-height (low-profile)