Supermicro 300W Mini Tower Server Chassis, Black (CSE-731D-300B) Mini-Tower & chassis support for max. motherboard size - 9.6" x 9.6" micro-ATX Supports single Intel / AMD processor Supports 4x full-height, full-length I/O expansion slots 300W AC power supply w/ PFC Case Type: Mini Tower Server Chassis M/B Type: micro-ATX (9.6 x 9.6 inch) Internal: 4x 3.5" tool-less HDD trays External: 2x 5.25" external drive bays, 1x 3.5" external drive bay(for card reader) Buttons: Power On/Off button Power Supply: 300W AC power supply with PFC; 80PLUS Bronze Level Certified