Synology D4ER01-4GB for FS3410, HD6500, SA Series

4GB DDR4 SO-DIMM ECC Unbuffered Memory Module from Synology.
Unbuffered and utilizing error-correcting code (ECC), this 260-pin SO-DIMM provides 4GB of DDR4 RAM. The module is compatible with the Synology DS923+, DS723+ RS822RP+, RS822+, DS2422+