External Drive Bays: 4 x 5.25" and 2 x 3.5" Internal Drive Bays: 4 x 3.5" H.D. System Board:: ATX Form Factor 12" x 10.5" or smaller Expansion slots: Standard ATX 7 slots Material: 0.7mm SECC Power Supply: PS2 size/ ATX12V P4 ready Power Supply Dimension(WxDxH): 200 x 450 x 430 mm