TS-473 | Affordable high-end AMD RX-421ND quad-core NAS with PCIe slots for adding M.2 SSD, 10GbE connectivity or a graphics card | QNAP (US)
QNAP Launches 73/4 / 6Bay TS-x8 Series NAS with AMD R-series Quad-core Processor, Dual M.2 SATA SSD Slots and Dual PCIe Slots for Adding M.2 SSD, 10GbE - HardwarEsfera
Recommended M.2 2280 SSDs for built-in slots of TS-473? - QNAP NAS Community Forum
Amazon.com: QNAP TS-473A-8G SAN/NAS Storage System : Electronics
PROVANTAGE: QNAP QM2-2P10G1TB QM2 Series 2XPCIE 2280 M2 SSD Slots PCIE 10GBE Nbase-T Port
QNAP TS-473A-8G-US 4 Bay SAN/NAS Storage System - 2x 2.5 GbE Port - AMD Ryzen V1500B | SabrePC