parts-quick 32GB Memory for QNAP TVS-H1288X Compatible DDR4 ECC 3200 MHZ UDIMM RAM (Equivalent to QNAP RAM-32GDR4ECK0-UD-3200) at Amazon.com
QNAP TVS-h874-i5-32G-US 8 Bay High-Speed Desktop NAS with M.2 PCIe Slots, 12th Gen Intel Core CPU, up to 64GB DDR4 RAM, 2.5 GbE Networking and PCIe Gen 4 expandability (Diskless)
QNAP x53D 16GB and 32GB Crucial Memory Upgrade Guide – NAS Compares
Amazon.com: QNAP 8-bay NAS/iSCSI IP-SAN, AMD R series Quad-core 2.1GHz, 8GB RAM, 10G-ready (TVS-873e-8G-US) : Electronics
Upgrade RAM Memory for QNAP NAS
QNAP RAM-8GDR4ECP0-UD-2666 | smicro.eu
How to Upgrade the Memory(RAM) of NAS | Qnap Advanced Support