parts-quick 16GB Memory for QNAP TVS-872XT Compatible RAM DDR4-2666 SO-DIMM at Amazon.com
G.Skill Ripjaws V Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-21300) DDR4 2666 CL15-15-15-35 1.20V Dual Channel Desktop Memory Model F4-2666C15D-16GVR at Amazon.com