Synology Rail Kit RKS-02
Synology 16GB DDR4 ECC Unbuffered DIMM (SA3400D, SA3200D, UC3400, UC3200, RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1619xs+, RS3618xs, RS2818RP+, RS2418RP+, RS2418+) D4EC-2666-16G
16 GB / 1 x 16 GB / DDR4 / 2666 MHz
Synology 16GB DDR4 ECC Unbuffered SODIMM (FS1018,RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+, DVA3221) D4ECSO-2666-16G
16 GB / 1 x 16 GB / DDR4 / 2666 MHz
Synology 8GB DDR4 ECC Unbuffered SODIMM (DS1823xs+, DS923+, DS723+, RS822RP+, RS822+, DS3622xs+, DS2422+, DS1522+) D4ES02-8G
8 GB / 1 x 8 GB / DDR4
Synology 16GB DDR4 ECC Unbuffered SODIMM (DS1823xs+, DS923+, DS723+, RS822RP+, RS822+, DS3622xs+, DS2422+, DS1522+) D4ES01-16G
16 GB / 1 x 16 GB / DDR4
Synology Rail Kit RKM114 (RS822+, RS822RP+, RS1619xs+, RS422+)