Upgrade the memory in select Synology NAS units using the 16GB DDR4 2666 MHz UDIMM Memory Module from Synology. This single RAM module features a capacity of 16GB, a clock speed of 2666 MHz (PC4-21300), and a 288-pin DIMM form factor. It operates using 1.2V, features Error-Correcting Code (ECC) technology, and is unbuffered. Features16GB DDR4 2666 MHz UDIMM Memory ModuleFor Select Synology NAS Units2666 MHz Clock SpeedSpecificationsCapacity: 16 GBKit Configuration: 1 x 16 GBSpeed: PC4-21300 (2666 MHz)Memory Type: DDR4DIMM Type: 288-Pin DIMMBuffered/Registered: NoError Correction (ECC): ECCVoltage: 1.2VWeight: 0.03 lbs