3U Rackmount Server Case with 16 Hot-Swappable SATA or SAS Drive Bays RPC-3216 Mini SAS Connectors 3U rackmount design, support standard ATX power supply only. Sixteen hot-swappable SATA (II or III) / SAS drive bays Four internal SFF-8087 Mini SAS connectors support up to sixteen 3.5" hot swappable SATA (II or III) or SAS hard disk drives; Six ball-bearing cooling fans for better ventilation Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6"), Mini ITX (6.7" x 6.7") motherboard