The SilverStone RM23-502-MINI 2U Micro-ATX Rackmount Server Chassis ensures maximum storage space with dual 5.25" drive bays. This server chassis also offers USB 3.1 Gen1 interface, supports ATX (PS2) / 2U single / 2U redundant power supplies, and is equipped with 4 low-profile PCI / PCIe slots. In addition, the built-in fan bracket supports up to two 80mm x 25mm fans for optimal cooling.