Synology DDR4 Memory Module RAM For Memory Size: 8 GBMemory Technology: DDR4 SDRAMMemory Voltage: 1.20 VMemory Speed: 2666 MHzMemory Standard: DDR4-2666/PC4-21333Error Checking: ECCSignal Processing: UnbufferedDevice Supported: NAS ServerNumber of Pins: 288-pinForm Factor: DIMMCompatibility: Synology RackStation NAS Servers: RS4017xs+ RS3618xs RS3617xs+ RS3617RPxs RS1619xs+ Limited Warranty: 5 Year