SUPERMICRO CSE-213A-R900UB Black 2U Rackmount Server Chassis 900W Redundant 1 External 5.25 Drive Bays Motherboard Compatibility: Support for maximum motherboard size of 13.68 x 13 Optimized for Universal I/O (UIO) motherboard Power Supply: 900W Redundant External 5.25 Drive Bays: 1 Hot-Swap Drive Bays: 16 x 2.5 SAS / SATA External Slim Drive Bays: 1 Front Ports: USB / COM 80mm Fans: 3 Dimensions (H x W x D): 24.8 x 17.2 x 3.5