Synology RAM DDR4 ECC Unbuffered SODIMM 4GB (D4ES02-4G) at Amazon.com
Synology DDR3 RAM « Blog | lesterchan.net
Synology Diskstation DS1821+ 8-Bay NAS Enclosure, 4-Core 2.2GHz, 4GB RAM, No HDD DS1821+
4GB DDR4-2666 PC4-21300 SODIMM Compatible with Synology DiskStation DS
Synology RAM DDR3L-1866 SO-DIMM 4GB (D3NS1866L-4G) at Amazon.com
Synology DS1621+ 6-Bay NAS with 4GB RAM, a Synology 2-port 10GbE Adapter and 36TB (6 x 6TB) of Synology Plus Drives and 1.6TB (2 x 800GB) Synology Cache Fully Assembled and Tested
4GB Memory for Synology DiskStation DS1815+ DDR3-1600 SODIMM RAM Module (PARTS-QUICK Brand) at Amazon.com
Synology DS1621+ 6-BAY DiskStation NAS with 4GB Synology RAM and 48TB – Customtechsales