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QNAP TS-251D-4G-US - *Discontinued* - 2-Bay NAS, Intel Celeron Apollo Lake J3355 dual-core 2.0GHz (up to 2.5GHz), 4GB DDR3L SODI
by QNAP
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2-Bay NAS, Intel Celeron Apollo Lake J3355 dual-core 2.0GHz (up to 2.5GHz), 4GB DDR3L SODIMM RAM (1x4GB, 2 DIMM slots, max 8GB total), SATA 6Gb/s, 1xGbE
| Mfg SKU # : | TS-251D-4G-US |
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The TS-251D-4G-US 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.
TS-251D-4G-US
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| CPU |
Intel® Celeron® J4025/J4005 dual-core 2.0 GHz processor |
| CPU Architecture |
64-bit x86 |
| Graphic Processors |
Intel® HD Graphics 600 |
| Floating Point Unit |
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| Encryption Engine |
(AES-NI) |
| Hardware-accelerated Transcoding |
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| 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 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 hard disk drives
2.5-inch SATA solid state drives |
| Hot-swappable |
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| M.2 SSD Slot |
Optional via a QM2 PCIe adapter |
| SSD Cache Acceleration Support |
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| 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 |
| Jumbo Frame |
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| PCIe Slot |
1
Slot 1: PCIe Gen 2 x4 PCIe bandwidth limitations will restrict the NAS 10GbE performance. |
| USB 2.0 port |
3 |
| USB 3.2 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) |
| 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 Tested with drives fully populated. |
| Fan |
1 x 70mm |
| Sound Level |
16.7 db(A) |
| System Warning |
Buzzer |
| Kensington Security Slot |
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| Max. Number of Concurrent Connections (CIFS) |
800 |
Note: Use only QNAP memory modules to maintain system performance and stability. For NAS devices with more than one memory slot, use QNAP modules with identical specifications. Warning: Using unsupported modules may degrade performance, cause errors, or prevent the operating system from starting.
* Sound Level Test Environment: Refer to ISO 7779; Maximum HDD loaded; Bystander Position; Average data from 1 meter in front of operating NAS.
Designs and specifications are subject to change without notice.
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