Antec Titan w/o PSU Enterprise Series Server Chassis without PSU Cases 10 Drive Bays, External 4 x 5.25" (one with 5.25" to 3.5" adapter, Internal 6 x 3.5" Double hinge door design: open the door up to 270 Ultra-quiet cooling system Expansion slots, 7. Compatible Motherboards: Extended ATX, Standard ATX, microATX, or Mini-ITX. Front-mounted ports for easy multimedia connections: Power supply not included Chassis made from 1.0 mm steel, for durability.