Designed for their TS-x83XU series, the 8GB DDR4 2666 MHz UDIMM ECC Memory Module from QNAP is a single RAM module that will let you upgrade the overall memory capacity of your compatible NAS. It features a capacity of 8GB, a clock speed of 2666 MHz (PC4-21300), and a 288-pin DIMM form factor. It operates using 1.2V, supports ECC technology, and is not buffered/registered. Applied Models: TS-983XU, TS-983XU-RP, TS-883XU, TS-883XU-RP, TS-1283XU-RP, TS-1683XU-RP, TS-2483XU-RP