This product is either discontinued or we cannot get that from suppliers.
QNAP TS-673-4G 6 Bay Diskless NAS, AMD R-Series RX-421ND quad-core 2.1 GHz, Turbo Core up to 3.4 GHz, 4 GB DDR4 (2x 2 GB), 6x SATA 6 Gbps (3.5/2.5-inch SATA hard disk drives, 2.5-inch SATA solid state drives), 2 x M.2 2260/2280 SATA 6Gb/s, 2x PCIe 3.0 x4, 4x GbE RJ45.
The QNAP TS-673-4G 6-Bay Diskless NAS (TS-673-4G) furnishes the storage capacity and provides fast performance required by businesses to deploy a private cloud service for easy access to files and data using any device.