Supports up to SSI-CEB motherboard / Supports ATX (PS2)/Mini redundant power supply up to 160mm deep / Supports Standard profile PCI / PCIe x 7 slots / Front door with key lock for extra security / Three 5.25" drive bays for flexible 5.25" device installation / 5Gbps Super Speed USB 3.1 Gen 1 interface, backward compatible with USB 2.0 / 1.1 / Mounting holes ready for quick rail slide installation (rail slide sold separately)