HP SmartArray P420, SAS, PCI Express x8, 0, 1, 1+0, 5, 6, 50, 60, 6 Gbit/s, 57 mm, 241 mm HP SmartArray P420. Supported storage drive interfaces: SAS, Host interface: PCI Express x8. RAID levels: 0, 1, 1+0, 5, 6, 50, 60, Data transfer rate: 6 Gbit/s. Width: 57 mm, Depth: 241 mm, Height: 191 mm