A-Tech 16GB Memory RAM for Synology DS DS1621+ - DDR4 2666 PC4-21300 ECC SO-DIMM 2Rx8 1.2V - Single NAS Server Upgrade Module (Compatible Replacement for D4ECSO-2666-16G) at Amazon.com
Synology DS918+ 16GB Guide – NAS Compares
Parts-Quick 4GB Memory for SYNOLOGY DS918+ DDR3L SO-DIMM RAM Module at Amazon.com
Parts-Quick 4GB Memory for SYNOLOGY DS918+ DDR3L SO-DIMM RAM Module at Amazon.com
Upgrading Memory on Synology DiskStation DS918+ -
CMS 16GB (2X8GB) DDR3 14900 1866MHZ NON ECC SODIMM Memory Ram Compatible with Synology DiskStation DS918+ - A5 - Walmart.com
CMS 16GB (2X8GB) DDR3 14900 1866MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Synology® DiskStation DS918+ - A5 at Amazon.com