Timetec 16GB KIT(2x8GB) Compatible for Synology NAS DiskStation/ RackStation DDR3/DDR3L 1600MHz PC3L-12800 1.35V Non-ECC Unbuffered SODIMM RAM (Replacement for Synology RAM1600DDR3L-8GBx2) at Amazon.com
CMS 16GB (2X8GB) DDR3 14900 1866MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Synology® DiskStation DS918+ - A5 at Amazon.com
Synology DS923+ Dual-Core 4-Bay NAS, 16GB RAM, 16TB (4 x 4TB) of Synology Enterprise Drives, and a 10GbE Adapter Fully Assembled and Tested By CustomTechSales - Newegg.com
A-Tech 4GB RAM Replacement for Synology D3NS1866L-4G | DDR3/DDR3L 1866 MHz PC3L-14900 SODIMM Non-ECC Unbuffered Memory Compatible for DS620slim, DS918+, DS718+, DS418play, DS218+ at Amazon.com