OWC 16GB UPGRADE: Consists of a single 16GB DDR4 2666 PC4-21300 CL19 2Rx8 288-pin 1.2V ECC Unbuffered DIMM Memory RAM Module Upgrade memory module compatible with QNAP models TS-883XU-RP, TS-983XU, TS-983XU-RP And TS-1886XU-RP. 100% COMPLIANT: JEDEC-Standard and ROHS Compliant. Warranty-Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs. EASY INSTALLATION: In Most Cases, Installing Memory is an Easy DIY project. Watch our OWC Basic Installation Video for Help. INDUSTRY LEADING: Consumer-friendly Advanced Replacement Program and Limited Lifetime Warranty, which includes Free Tech Support by Other World Computing. Replacement for QNAP part numbers RAM-16GDR4ECT0-UD-2666 and RAM-16GDR4ECP0-UD-2666.