Synology RAM Module is designed especially for selected Synology Disk Station models to expand memory capacity. Key Features Available capacity: 2GB Compatibility: DS3612xs, DS3611xs, RS3412xs/RS3412 R Pxs, RS3411xs/RS3411 R Pxs Technology: DDR2 SDRAM Memory Speed: 800 MHz (PC2-6400) Data Integrity Check: ECC Synology ECC RAM Module is designed especially for Synology XS-series to expand memory capacity. ECC RAM is predominantly used in servers to combat against the likelihood of errors strikes introduced during data storage or transmission. An installation guide is enclosed within the accessory kit to take you through the installation procedure.