A-Tech 16GB Kit (2x8GB) RAM for QNAP TS-855eU-RP NAS | DDR4 2933MHz PC4-23400 SODIMM 1.2V 260-Pin Non-ECC SO-DIMM Memory Upgrade at Amazon.com
How To Upgrade RAM in QNAP NAS TS-251 + (2 bay and 4 bay NAS) - YouTube
Upgrade RAM Memory for QNAP NAS
QNAP TS-264 2-Bay High-Performance Desktop NAS. Intel 4C/4T Processor, burst up to 2.9GHz with 8GB DDR4 RAM On-Board, 2 x 2.5GbE, 2 x M.2 2280 PCIe Gen 3 x1, 1 x PCIe