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  • Intel Dual-Core Multimedia NAS with PCIe slot
  • 2 x 3.5-inch SATA 6Gb/s
  • HDMI connection for streaming multimedia
  • 4GB SO-DIMM DDR4 (1 x 4 GB)
When ordering NAS + HDD's you get free assembly!

Product Description TS-251D-4G

The TS-251D integrates secure data storage and multimedia entertainment on a single device. Thanks to its PCIe slot, the TS-251D allows you to expand NAS functionality and run additional applications. You can improve overall system performance by installing a QNAP QM2 card for M.2 SSD caching/10GbE connectivity in combination with Qtier automated layered storage and installing a 10GbE/5GbE/2.5GbE network expansion card. In addition, TS-251D can be used with the intelligent AI photo management application from QNAP, QuMagie, which integrates AI image recognition for grouping similar photos into albums “People”, “Objects” and “Places”. The TS-251D is equipped with an HDMI connection for streaming multimedia in your home. The TS-251D supports dual-channel hardware decoding and transcoding that allows you to view NAS media files on different devices with ease.

  • The PCIe port supports the installation of a 10GbE/5GbE/2.5GbE network expansion card, a QM2 card, a USB 3.1 Gen 2 card (10Gbps) or a wireless network card.
  • There is the possibility to play 4K media and online transcoding, and multimedia can be viewed on different devices via HDMI output or streaming applications.
  • Snapshots make a complete recording of system status and data. If files are accidentally deleted or changed, previously recorded data can be recovered quickly.
  • QNAP offers an extensive range of multimedia applications. You can manage all apps through the Multimedia Console for easier management.
  • HBS allows NAS data to be synchronized and backed up to other external servers or cloud storage, while QuDedup deduplicates data to the source to limit network bandwidth and storage.
  • Use VJBOD (Virtual JBOD) to expand your storage capacity by using unused storage from other QNAP NAS. You can connect up to two TR series USB storage devices.

For more information, please visit this products webpage.


Type Tower
CPU Intel Celeron J4005 dual-core 2.0 GHz processor
RAM 4 GB SO-DIMM DDR4 (1 x 4 GB)
Nr. of HDD slots 2 slots
Harddisk interface 2,5'' SATA III, 3,5'' SATA III, 2,5'' SSD
RAID Single Disk, JBOD, RAID 0, RAID 1, Hot spare
External interface 3x USB 2.0, 2x USB 3.0, 1 x PCIe
LAN 1 x 1 Gigabit
Encryption Software based
Link aggregation No
Redundant power supply No
Wireless No
Specials HDMI output
Warranty 2 year
EAN Code 4713213516676

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CPU Intel Celeron J4005 dual-core 2.0 GHz processor (burst up to 2.7 GHz)
CPU architecture 64-bit x86
Graphics processors Intel HD Graphics 600
Floating Point Unit Yes
Encryption engine Yes (AES-NI)
Hardware-accelerated transcoding Yes
System memory 4 GB SO-DIMM DDR4 (1 x 4 GB)
Maximum amount of memory 8 GB (2 x 4 GB)
Memory slot 2 x SO-DIMM DDR4
For dual DIMM configuration, you must use a pair of identical DDR4 modules.
Flash memory 4 GB (Dual boot OS protection)
Disk slot 2 x 3.5-inch SATA 6Gb/s, 3Gb/s
The system is supplied without hard disks.
Disk compatibility 3.5 inch SATA hard drives
2.5 inch SATA hard drives
2.5 inch SATA solid state disks
Hot swappable Yes
M.2 SSD slot Optional via a QM2 PCIe adapter
Support SSD cache acceleration Yes
Gigabit Ethernet port (RJ45) 1
Expandable with an optional PCIe adapter
5 Gigabit Ethernet Port Expandable with an optional PCIe adapter
10 Gigabit Ethernet port Expandable with an optional PCIe adapter
Jumbo Frame Yes
PCIe slot 1
Slot 1: PCIe Gen 2 x4
PCIe bandwidth limitations will restrict the NAS 10GbE performance.
USB 2.0 port 3
USB 3.0 port 2
USB 3.1 Gen 2 (10 Gbps) port Optional via a PCIe expansion card
IR Sensor Yes (Optional QNAP RM-IR004 remote control)
HDMI output 1, HDMI 2.0
Shape Tower
LED indicators Power/Status, LAN, USB, HDD1-2
Buttons Power, USB copy, Reset
Dimensions (HxWxD) 168 x 105 x 226 mm
Weight (net) 1.48 kg
Weight (gross) 2.58 kg
Operating temperature 0 - 40C
Relative humidity 5-95% RH non-condensing, wet bulb: 27C
Power supply External power adapter, 65 W, 100-240V
Power consumption: HDD sleep mode 8.08 W
Power consumption: Operating mode, typically 15.25 W
Fan 1 x 70 mm
Noise level 16.7 dB (A)
System warning Buzzer
Kensington security lock yes

Did you notice a wrong specification? Please let us know.