Sophisticated Performance Refined. XL-ATX, Standard ATX, microATX, Mini-ITX mobo compatability, 9 expansion slots with 4 designed to hold 13" GPU cards, Top power switch, USB 2 x 3.0(internal connect), 2 USB2.0, Audio I/O HAD-AC'97, 3 5.25" tool-less drive bays, 2 x 2.5" drive bays, 6 x 3.5"/2.5" drive trays w preinstalled silicone groumets, max CPU height 6.7", triple-layer front door w double hinge.