QNAP 24-Bay 10GbE iSCSI NAS, 4U, SATA 6G, 4 x 1GbE, 2 x 10GbE (SFP+), 40GbE-ready, Redundant PSU Port USB: 4 x USB3.0 + 4 x USB2.0 HDD Interface: 24 x 3.5-inch SAS 12Gbps, SAS / SATA 6Gbps / 3Gbps hard drive or 2.5-inch SAS / SATA SSD hard drive Port Others: Built-in 2 x 10 GbE (SFP+) and 4 x GbE 40GbE is optional Form Factor: 4U Processor: Intel Xeon E3 Quad-core processor Default/ Max. Memory: System memory: 4 GB DDR3 ECC RAM Memory module pre-installed: 2 GB x 2 Memory expandable up to: 32 GB (8GB x 4) LEDs: Status, 10 GbE, LAN, eSATA, storage expansion port status Power: Power Consumption (W) Sleep mode: 129.43 In Operation: 263.81 W (with 24 x HITACHI HUS724020ALA640 hard drive installed Power Supply Redundant power: Input: 50-60 Hz; 100-127V / 8.5A; 200-240V / 4.2A Output: 650W