Synology DS1621+ 6 x 6TB Seagate IronWolf drives, 5400RPM, 3 year warranty – 36TB Gross Capacity, NASBIT tested and ready to use out of the box. AMD Ryzen V1500B 4-core 2.2 GHz CPU, 4 GB DDR4 ECC SODIMM, upgradable to 32 GB (16 GB x 2). DS1621+ comes with built-in dual M.2 SSD cache slots capable of providing I/O response speeds 20 times faster than hard drives without occupying front drive bays. 4x RJ-45 1GbE LAN Ports with Link Aggregation and Failover support.