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
4GB DDR3-1600 (PC3-12800) SODIMM Memory RAM for Synology DS1515+
4GB Memory for Synology DiskStation DS1815+ DDR3-1600 SODIMM RAM Module (PARTS-QUICK Brand) at Amazon.com
4GB D4NESO-2666-4G DDR4 260-Pin Sodimm RAM | Memory for Synology
parts-quick 4GB Memory for Synology DS220+ Compatible DDR4 SODIMM 2666MHz RAM 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 DDR3-1600 (PC3-12800) SODIMM Memory RAM for Synology DS1515+