Download media files without having to power up your PC with the built-in BitTorrent client. Y Does not contain "conflict minerals": tantalum, tin, tungsten, and gold. Y QNAP TS-251D, NAS, Tower, Intel® Celeron®, J4005, 4 GB, DDR4 QNAP TS-251D. Type: NAS. Chassis type: Tower. Device class: Home & Home Office. Processor family: Intel® Celeron®, Processor model: J4005, Processor frequency: 2 GHz. Internal memory: 4 GB, Internal memory type: DDR4. Total installed storage capacity: 20 TB, Installed storage drive type: HDD. Operating system installed: QNAP Turbo System