Athena Power RM-2U251L50P4 Black 1.2mm SECC 2U Rackmount Server Chassis 500W PS2 Single (AP-P4ATX50F) 2 External 5.25 Drive Bays Motherboard Compatibility: MicroATX (9.6 in. x 9.6 in.) ATX (12 in. x 9.6 in.) Mini-ITX (6.7 in. x 6.7 in.) Power Supply: 500W PS2 Single (AP-P4ATX50F) External 5.25 Drive Bays: 2 External 3.5 Drive Bays: 2 Internal 3.5 Drive Bays: 3 Expansion Slots: 7 x Low-Profile (Vertical) Front Ports: 1 x Dual-Port USB 2.0 80mm Fans: 2 (Center)