QNAP TS-253D, NAS, Mini Tower, Intel® Celeron®, J4125, 4 GB, DDR4 QNAP TS-253D. Type: NAS. Chassis type: Mini Tower. Device class: Home & Home Office. Processor family: Intel® Celeron®, Processor model: J4125, Processor frequency: 2 GHz. Internal memory: 4 GB, Internal memory type: DDR4. Total installed storage capacity: 12 TB, Installed storage drive type: HDD. Operating system installed: QNAP Turbo System