RAM capacity can be expanded on selected Synology NAS servers for boosted performance and responsiveness under high system loads. To ensure the optimum durability and compatibility, always select Synology authentic RAM modules from your local distributors and 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-4GBx2 / RAM1600DDR3L-8GBx2) DDR3L-1600 unbuffered SO-DIMM 204pin CL=11 1. 35V / 1. 5V Applied models : Synology Disk Station: DS1817+, DS1517+