RAM capacity can be expanded on selected Synology NAS servers for boosted performance & responsiveness under high system loads. To ensure the optimum durability & compatibility, always select Synology authentic RAM modules from your local distributors & follow the installation instructions in your product quick installation guides. Synology will not provide complete product warranty or technical support if non-Synology RAM modules are used for memory upgrade. 8GB (4GB x 2) / 16GB (8GB x 2) Kit (RAM1600DDR3L-4 G Bx 2 / RAM1600DDR3L-8 G Bx 2) DDR3L-1600 unbuffered SO-DIMM 204pin CL=11 1.35V / 1.5V Applied models: Synology Disk Station: DS1817+, DS1517+