Streacom FC5B-ALPHA-OPT Fanless Aluminum Case Motherboard Compatibility: Mini-ITX, Micro-ATX and Full ATX Internal 3.5 Drive Bays: Maximum 3 x 3.5, Depending on Configuration Expansion Slots: 1 x Full Height Expansion Card (Flexible Riser Required) Front USB Ports: 2 x USB3.0, Left & Right Side, 19/20 PIN