SYNOLOGY Synology DS1821+ diskless 8 bay NAS, AMD Ryzen V1500B 4-core 2.2 GHz CPU, 4 GB DDR4 ECC SODIMM, upgradable to 32 GB (16 GB x 2). DS1821+ comes with built-in M.2 SSD cache slots capable of providing I/O response speeds 20 times faster than hard drives without occupying front drive bays.