QNAP TS-873, NAS, Tower, AMD Embedded R-Series SoC, RX-421ND, 4 GB, DDR4 QNAP TS-873. Type: NAS. Chassis type: Tower. Device class: Home & Home Office. Processor family: AMD Embedded R-Series SoC, Processor model: RX-421ND, Processor frequency: 2.1 GHz. Internal memory: 4 GB, Internal memory type: DDR4. Total installed storage capacity: 32 TB, Installed storage drive type: HDD. Operating system installed: QNAP Turbo System