QNAP TS-453BU-RP-4G 4-Bay 1U Rackmount NAS Enclosure - Intel Celeron J3455 Processor (2M Cache, 1.50 GHz, up to 2.3 GHz, 4 cores), 4GB DDR3L RAM (2 x 2GB, no slots free, 8GB Max), 4GB Flash Memory, Drive Interface: 4 x 3.5-inch/2.5-inch SATA 6Gbps/3Gbps Hard Drives Bays, Hot-swappable, Up to 40TB Max, Connectivity: 4 x USB 3.0, 1 x HDMI 1.4b, 4 x Gigabit RJ-45 Ethernet Ports, 2 x 10GbE SFP+ Ports, 1 x PCIe Gen 2 x2, 2 x 250W Redundant Power Supplies