QNAP TS-251D-4G 2 Bay Home NAS - Intel® Celeron® J4005 CPU and One 1GbE Port | TS-251D-4G
- Free delivery by Monday, Nov 02
- Bank transfer payment
- 1 Year warranty
- Free returns
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.
Flexible PCIe expansion
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.
4K HDMI™ output
Provide 4K media playback and online transcoding, while enabling cross-device multimedia viewing via HDMI™ output or streaming applications.
Snapshot protection against Ransomware
Snapshots fully record the system status and data. If files are accidentally deleted or modified, you can quickly restore previously-recorded data.
Centralized multimedia management
QNAP provides a wide range of multimedia applications. You can manage all apps through the Multimedia Console to simplify management.
Data backup and recovery
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.
Flexible storage expansion
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.
Smart AI Photo Management
QuMagie integrates QuMagie Core AI image recognition technology for facial recognition, subject identification, and geotagging photos. Similar photos are categorized into People, Places, and Things albums. Moreover, QuMagie features a built-in timeline scroll, customizable folder covers, iOS® Live Photo display and a powerful search tool, to provide you with the ultimate photo management and image sharing solution.
Learn More: QuMagie

| Brand | QNAP |
|---|---|
| Model | TS‑251D‑4G |
| SKU | 3905 |
| Warranty | 1 Year |
| Weight | 2.00 kg |
| Dimensions | 40x30x10 cm |
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
Encryption Engine
(AES-NI)
Hardware-accelerated Transcoding
System Memory
4 GB SODIMM DDR4 (1 x 4 GB)
Maximum Memory
8 GB (2 x 4GB)
Memory Slot
2 x SODIMM DDR4
For dual-DIMM configuration, you must use a pair of identical DDR4 modules.
Flash Memory
4GB (Dual boot OS protection)
Drive Bay
2 x 3.5-inch SATA 6Gb/s, 3Gb/s
The system is shipped without HDD.
For the HDD compatibility list, please visit https://www.qnap.com/compatibility/
Drive Compatibility
3.5-inch SATA hard disk drives
2.5-inch SATA solid state drives
Hot-swappable
(Not supported M.2 SSD)
M.2 Slot
Optional via a QM2 PCIe adapter
SSD Cache Acceleration Support
Gigabit Ethernet Port (RJ45)
1
Expandable with an optional PCIe adapter
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)
Jumbo Frame
PCIe Slot
1
Slot 1: PCIe Gen 2 x4
PCIe bandwidth limitations will restrict the NAS 10GbE performance.
Card dimensions for PCIe slot:190 x 68.9x 18.76 mm / 7.48 x 2.71 x 0.74 inches.
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
(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
65W adapter (12VDC), 100-240VAC
Power Consumption: Disk Standby Mode
8.08
Power Consumption: Operating Mode, Typical
15.25 W
Tested with drives fully populated.
Fan
1 x 70mm
System Warning
Buzzer
Kensington Security Slot
Standard Warranty
2
Max. Number of Concurrent Connections (CIFS) - with Max. Memory
1500
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