QNAP 8GB DDR4 2666 MHz UDIMM ECC Memory Module (RAM-8GDR4ECP0-UD-2666)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