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. Always select authentic Synology memory modules from local distributors 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.Increase your Synology NAS' performance with this Synology D4EC-2666-16G 16GB DDR4 ECC UDIMM RAM Module. Please check your NAS handbook for compatibility or visit www.synology.com for further details. Compatible with . UC3200SA3200DRS4017xs+RS3618xsRS3617xs+RS3617RPxsRS2818RP+RS2418+RS2418RP+RS1619xs+ Please note When installing more than one DIMM it is recommended to get the same type of memory (same size same speed same manufacturer) for each slot..