Synology RAM 8 GB DDR4 ECC unbuffered SO-DIMM pre RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+
Synology RAM 4 GB DDR4-2666 non-ECC unbuffered SO-DIMM 260pin 1.2V
Synology RAM 4 GB DDR4 ECC unbuffered SO-DIMM pre RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+