Synology RAM Module is designed especially for selected Synology Disk Station models to expand memory capacity. Key Features 2GB module Suitable for Synology Disk Station: DS3611xs Suitable for Synology Rack Station: RS3411xs/RS3411 R Pxs While the applicable models are capable of holding one extra RAM module, the Synology RAM Module is fully-compatible & is the official recommended memory expansion kit. An installation guide is enclosed within the accessory kit to take you through the installation procedure. Please note: networking components such as switches, routers, UPS & wireless devices require that speeds & standards be consistent throughout the network to gain optimum performance. To avoid compatibility clashes or for advice, please contact us on solutions@ebuyer.com.