CPU AMD R-Series RX-421ND quad-core 2.1 GHz processor, turbo core up to 3.4 GHz Hardware Encryption Engine: Yes, AES-NI System Memory 4GB DDR4 (1 x 4GB) Maximum Memory 64GB (4 x 16GB) Memory Slot 4 x UDIMM DDR4 (For dual- or quad-DIMM configurations, you must use a pair of identical DDR4 modules.) Flash Memory 512MB DOM Drive Bay 8 x 3.5'/2.5' SATA 6Gb/s HDDs/SSDs M.2 SSD Slot 2 x M.2 2280 SATA 6Gb/s SSDs Note: 1. The M.2 SSD is not included as standard. 2. M.2 SSD operations can easily generate excessive heat. It is recommended to install a heatsink (from QNAP or a third-party provider) on the M.2 SSD. 10 Gigabit Ethernet Port 2 x 10GbE SFP+ port via a preinstalled PCIe network card Gigabit Ethernet Port 4 x Gigabit RJ45 LAN ports PCIe Slot 1 x PCIe Gen 3 (x4), pre-installed with a dual-port 10GbE SFP+ LAN card USB Port 2 x USB 3.0 port 4 x USB 2.0 port LED Indicators Status/Power，LAN，USB, Drive 1 - 8 Buttons Power/Status, Reset Maintenance Port 1 x 3.5mm console port Form Factor 2U Rackmunt Dimensions (H x W x D) 89 x 482 x 534 mm 3.5 x 18.98 x 21.02 inch Weight Net weight: 9.85 kg (21.72 lbs.) Operating Temperature & Relative Humidity 0 ~ 40˚C ( 32˚F ~ 104˚F ), 5 ~ 95% RH non-condensing, wet bulb: 27˚C Power Supply Unit 250W, 100-240V AC, 50/60 Hz Fan 2 x 70mm, 12V DC