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Always select authentic Synology memory modules for optimum compatibility and reliability. Installation of non-Synology memory modules can lead to system instability or boot failures. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
Synology 4GB DDR4 ECC Unbuffered SO-DIMM Applied Models: RS1221RP+, RS1221+, DS1821+, DS1621+
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