32GB (2X16GB) Memory Ram Compatible with Synology DiskStation DS1819+ By CMS C108 System Specific Memory - Newegg.com
Timetec 4GB Compatible for Synology NAS DiskStation DS1618+, DS1819+, DS2419+ DDR4 2400Mhz PC4-19200 1.2V Non-ECC Unbuffered 260 Pin SODIMM RAM Upgrade (Replacement for Synology D4NESO-2400-4G) at Amazon.com
Synology DS1621+ DiskStation with 32GB RAM, an E10G18-T2 10GbE Card and 72TB (6 x 12TB) of Synology Enterprise HAT5300 Drives Fully Assembled and Tested By CustomTechSales Desktop NAS - Newegg.com
Amazon.com: Synology DiskStation DS1819+ iSCSI NAS Server with Intel Atom 2.1GHz CPU, 16GB Memory, 32TB HDD Storage, DSM Operating System : Electronics