Always select authentic Synology memory modules from local distributors for the optimum compatibility & reliability Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion Power Memory voltage 135 VDesign Compatible products Synology Disk Station DS918 DS718 DS218 DS418play Product colour Green Memory Memory layout (modules x size) 1 x 4 GBInternal memory 4 GBComponent for PCserver Memory form factor 204-pin SO-DIMMMemory voltage 135 VMemory clock speed 1866 MHz Internal memory type DDR3L