RAM & Memory Upgrades
OWC 32GB (2X16GB) DDR4 RAM Compatible With Synology DiskStation DS1522+ 2666MHz PC4-21300 CL19 ECC SODIMM 2Rx8 1.2V Memory Upgrade
OWC 32GB UPGRADE: Consists of 2pcs of 16GB DDR4 2666MHz PC4-21300 CL19 2RX8 ECC SO-DIMM 1.2V 260-pin Memory Modules Compatible with Synology part numbers D4ECSO-2666-16G, D4ES01-16G Compatible for Synology NAS DiskStation, RackStation, FlashStation,...
https://www.bizrate.co.uk/ram_memoryupgrades/owc-32gb-2x16gb-ddr4-ram-oid33488778763.html