Synology 16GB (2x8GB) DDR3L 1600MHz Unbuffered SODIMM 204-pin 1.35V/1.5V RAM Module for DS1517+ / DS1817+ / RS818+ / RS818RP+ Synology DDR3 Memory Module Always select authentic Synology memory modules from local distributors for the optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. DDR3L-1600 unbuffered SO-DIMM 204pin 1.35V/1.5V Applied Models Synology DiskStation: DS1817+, DS1517+ Synology RackStation: RS818+/RS818RP+