Kingston 16 GB DDR4 2666 MHz ECC Registered KTD-PE426D8/16G
Kingston 8 GB DDR4 2666 MHz ECC Registered KTD-PE426S8/8G
Synology RAM 8 GB DDR4 ECC unbuffered SO-DIMM pre RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+
Synology RAM 4GB DDR3L-1866 SO-DIMM 204 pin 1,35 V
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+