Supports ATX (PS2) / 2U single / 2U redundant power supplies / Supports 1 x 2.5" SSD and up to 2 x 3.5" HDD / 5Gbps USB 3.1 Gen1 interface (downward compatible with USB 2.0 & USB 1.1) / Dual 5.25" expansion bay brings flexibility in installing 5.25" devices / Built-in fan bracket supports up to two 80mm x 25mm fans / Supports Micro-ATX motherboard (9.6" x 9.6") / Supports 4 low-profile PCI / PCIe slots