First home/SOHO Intel dual-core NAS with a PCIe slot for extending NAS functionality
The TS-251B combines secure data storage and multimedia entertainment into one device. Featuring a PCIe slot, the TS-251B is QNAP’s first home/SOHO NAS that allows you to flexibly extend its functionality and potential applications. You can install a QNAP QM2 card to provide M.2 SSD caching/10GbE connectivity and use with Qtier auto-tiering storage to enhance overall system performance; or install a wireless network card (such as the QNAP QWA-AC2600) to turn the TS-251B into a wireless access point and to wirelessly stream your multimedia throughout your home. The TS-251B supports dual-channel H.264 hardware decoding and transcoding, allowing you to enjoy watching NAS media files smoothly across various devices.
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The PCIe port supports installing a 10GbE network card, a QM2 dual-port M.2 SSD/10GbE card, a USB 3.1 Gen 2 (10Gbps) card, or a wireless network card.
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4K media playback and online transcoding; cross-device multimedia viewing via HDMI output or streaming applications.
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Snapshots fully record the system status and data. If files are accidentally deleted or modified, you can quickly restore the previously-recorded data.
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Hybrid Backup Sync consolidates backup and sync tasks into a single app, providing multiple layers of data protection.
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Remotely access the apps and files on your TS-251B via myQNAPcloud and easily manage and share files.
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Supports containerized applications and hosting virtual machines with various operating systems.
Available Models
TS-251B-2G
Intel® Celeron® J3355 dual-core 2.0 GHz processor (burst up to 2.5 GHz) with 2GB RAM (1 x 2GB)
TS-251B-4G
Intel® Celeron® J3355 dual-core 2.0 GHz processor (burst up to 2.5 GHz) with 4GB RAM (1 x 4GB)
Specification:
| CPU | Intel® Celeron® J3355 dual-core 2.0 GHz processor (burst up to 2.5 GHz) Architecture: 64-bit x86 |
| Graphics | Intel® HD Graphics 500 |
| Encryption Acceleration | (AES-NI) |
| System Memory | 2 GB DDR3L (1 x 2 GB) (TS-251B-2G)
4 GB DDR3L (1 x 4 GB) (TS-251B-4G) |
| Maximum Memory | 8 GB (2 x 4 GB) |
| Memory Slot | 2 x SODIMM DDR3L up to 1866, with dual-channel support |
| Flash Memory | 4GB eMMC |
| Drive Bay | 2 x 3.5″ SATA 6 Gbps HDD |
| Drive Compatibility | • 3.5″ SATA 6Gb/s HDD • 2.5″ SATA 6Gb/s HDD • 2.5″ SATA 6Gb/s SSD |
| SSD Cache Acceleration Support | 3.5″ drive bay：1 to 2 |
| Gigabit Ethernet Port | 1 x RJ45 |
| USB Port | 2 x USB 3.0, 3 x USB 2.0 |
| USB One Touch Copy | Front：USB 3.0 Type-A |
| PCIe Slot | 1 PCIe 2.0 x2 slot |
| HDMI Output | 1 x HDMI v1.4b (up to 3840 x 2160 resolution at 30 Hz) |
| IR sensor | , supporting QNAP RM-IR004 remote control (optional purchase) |
| Audio | 1 x speaker, 2 x MIC Input 1 x 3.5 mm line-out jack Alarm buzzer Note: You cannot use the speakers and the line-out jack simultaneously. |
| LED Indicators | Status/power、LAN、USB、HDD 1 – 2 |
| Buttons | Power, Reset, USB One-touch-copy |
| System Warning | Alarm buzzer and voice prompts |
| Form Factor | Tower |
| Dimensions (H x W x D) | 168 x 105 x 226 mm ( 6.61 x 4.13 x 8.90 inch) |
| Net Weight | 1.53 kg (3.37 lbs) |
| Power Consumption (W) | HDD standby：8.08 W In operation：15.25 W (with 2 x 1TB HDDs installed) |
| Sound Level | Sound pressure (LpAm): 17.3 dB(A) |
| Power Supply Unit | 65W AC adapter, 100-240V |
| Fan | 1 x 7 cm |
| Operating Temperature & Relative Humidity | 0 ~ 40˚C ( 32˚F ~ 104˚F ), 5 ~ 95% RH non-condensing, wet bulb: 27˚C (80.6˚F) |
| Other Interfaces | Kensington security slot |
