QNAP TS-251D-4G (Intel® Celeron® J4025 dual-core 2.0 GHz processor (burst up to 2.9 GHz)

The TS-251D integrates secure data storage and multimedia entertainment into one device. Featuring a PCIe slot, the TS-251D allows you to flexibly extend NAS functionality and potential applications. You can enhance overall system performance by installing a QNAP QM2 card for M.2 SSD caching/10GbE connectivity combined with Qtier auto-tiering storage and installing a 10GbE/5GbE/2.5GbE network expansion card. In addition, TS-251D can be used with QNAP’s smart AI photo management application, QuMagie, which integrates AI image recognition to group similar photos together in album “People”, “Things” and “Places”. The TS-251D features an HDMI slot to stream multimedia throughout your home. The TS-251D supports dual-channel hardware decoding and transcoding, allowing you to view NAS media files smoothly across various devices.

• The PCIe port supports the installation of a 10GbE/5GbE/2.5GbE/ network expansion card, a QM2 card, a USB 3.2 Gen 2 (10Gbps) card, or a wireless network card.

• Provide 4K media playback and online transcoding, while enabling cross-device multimedia viewing via HDMI output or streaming applications.

• Snapshots fully record the system status and data. If files are accidentally deleted or modified, you can quickly restore previously-recorded data.

• QNAP provides a wide range of multimedia applications. You can manage all apps through the Multimedia Console to simplify management.

• HBS backs up and synchronizes NAS data to other remote servers or cloud storage, while QuDedup deduplicates data at the source to reduce network bandwidth and storage space.

• Use VJBOD (Virtual JBOD) to expand your storage capacity by using the unused storage of other QNAP NAS. Connect up to two TR series USB storage enclosure.

Hardware Specification

• CPU: Intel® Celeron® J4025/J4005 2-core/2-thread processor, burst up to 2.9/2.7 GHz
• CPU: Architecture: 64-bit x86
• Graphic 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 Memory: 8 GB (2 x 4GB)
• Memory Slot: 2 x SO-DIMM DDR4
• Flash Memory: 4GB (Dual boot OS protection)
• Drive Bay: 2 x 3.5-inch SATA 6Gb/s, 3Gb/s
• Drive Compatibility: 3.5-inch SATA hard disk drives
  2.5-inch SATA hard disk drives
  2.5-inch SATA solid state drives
• Hot-swappable: Yes
• M.2 SSD Slot: Optional via a QM2 PCIe adapter
• SSD Cache Acceleration Support: Yes
• Gigabit Ethernet Port (RJ45): 1
• 5 Gigabit Ethernet Port (5G/2.5G/1G/100M): Expandable with an optional PCIe adapter
• 10 Gigabit Ethernet Port: Expandable with an optional PCIe adapter
• Wake on LAN (WOL): Yes
• Jumbo Frame: Yes
• PCIe Slot: 1, Slot 1: PCIe Gen 2 x4
• USB 2.0 port: 3
• USB 3.2 Gen 1 port: 2
• USB 3.2 Gen 2 (10Gbps) Port: Optional via a PCIe expansion card
• IR Sensor:  Yes (Optional QNAP RM-IR004 remote control)
• HDMI Output: 1, HDMI 2.0
• Form Factor: Tower
• LED Indicators: Power/Status, LAN, USB, HDD1-2
• Buttons: Power, USB copy, Reset
• Dimensions (HxWxD): 168 × 105 × 226 mm
• Weight (Net): 1.48 kg
• Weight (Gross): 2.58 kg
• Operating temperature: 0 – 40 °C (32°F – 104°F)
• Storage Temperature: -20 – 70°C (-4°F – 158°F)
• Relative Humidity: 5-95% RH non-condensing, wet bulb: 27˚C (80.6˚F)
• Power Supply Unit: External Power Adapter, 65W, 100-240V
• Power Consumption: HDD Sleep Mode: 8.08 W
• Power Consumption: Operating Mode, Typical: 15.25 W
• Fan: 1 x 70mm
• Sound Level: 16.7 db(A)
• System Warning: Buzzer
• Kensington Security Slot: Yes
• Warranty: 2 year