QNAP TS-1253DU-RP, NAS, Rack (2U), 4 GB, DDR4, HDD, Aluminum, Black QNAP TS-1253DU-RP. Type: NAS. Chassis type: Rack (2U). Device class: Small & Medium Business. Processor frequency: 2 GHz. Internal memory: 4 GB, Internal memory type: DDR4. Installed storage drive type: HDD