parts-quick 8GB Memory for QNAP TVS-471 DDR3L 1600MHz PC3L-12800 SODIMM Compatible RAM at Amazon.com
Amazon.com: QNAP TVS-h674-i5-32G-US 6 Bay High-Speed Desktop NAS with 12th Gen Intel Core CPU, up to 64GB DDR4 RAM, 2.5 GbE Networking and PCIe Gen 4 expandability (Diskless) : Electronics
A-Tech 8GB Module for QNAP TVS-871 TVS-671 TVS-471 IS-400 Pro NAS Servers - DDR3 1600MHz PC3-12800 Non-ECC SODIMM 1.5V Memory RAM (Replacement for QNAP RAM-8GDR3-SO-1600) at Amazon.com
QNAP TVS-471-4G (TVS-x71): High Performance NAS with Intel Processor - Bjorn3D.com
A-Tech 8GB Module for QNAP TVS-871 TVS-671 TVS-471 IS-400 Pro NAS Servers - DDR3 1600MHz PC3-12800 Non-ECC SODIMM 1.5V Memory RAM (Replacement for QNAP RAM-8GDR3-SO-1600) at Amazon.com
Disassembly guide in replacing the CPU and RAM on the QNAP TVS-871 – Poyu