Synology DS1621xs+ diskless 6 bay NAS, Intel Xeon D-1527 4-core 2.2 (base) / 2.7 (turbo) GHz CPU, 8 GB DDR4 ECC SODIMM, upgradable to 32 GB (16 GB x 2). DS1621xs+ 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. The built-in 10GbE port provides fast data transmission and can be bonded with an additional network interface card for higher network bandwidth.