Enhance the performance of your compatible QNAP NAS enclosure with this 8GB ECC DDR4 2666 MHz UDIMM Memory Module. Designed primarily for the QNAP TS-h686 and TS-h886 NAS systems, this 8GB, 288-pin UDIMM operates at 2666 MHz and features error correcting code, or ECC, to help ensure that common data-writing errors are automatically fixed. Applied Models: TS-h686, TS-h886, TNS-h1083X, TS-x83XU, TS-x73AU