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1U short depth rackmount 2.5GbE NAS suited for small-to-midsize offices and audiovisual rooms

QNAP Products
SMB Storage
QNAP 1U 4-Bay 11.6”-depth NAS, Intel Celeron J4025 dual-core 2.0GHz (up to 2.9GHz), 2GB DDR4 SODIMM RAM (1x2GB, 2 slots, max 8GB total)
SATA 6Gb/s, 2 x 2.5GbE, AES-NI encryption, 2 x USB 3.0, 2 x USB 2.0, hardware transcoding, max 1 TL-D800C or 2 x TR-002/TR-004 expansion unit, single power 100W
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Please Note: All Prices are Inclusive of GST

Package Content

  • QNAP TS-451DeU Storage
  • 2 x Ethernet cables
  • 1 x Power cords
  • 16 x Flat head screw (for 3.5" HDD)
  • 12 x Flat head screw (for 2.5" HDD)
  • 2 x M.2 SSD Heatsink
  • 2 x Hanger
  • 2 x Holder
  • Quick Installation Guide


The compact and feature-rich TS-451DeU combines an Intel® Celeron® dual-cord 2.0 GHz processor and 2.5GbE connectivity in one chassis, providing businesses with a modern 2.5GbE NAS solution to tackle everyday tasks like file backup/restore, and to boost team collaboration with higher productivity. The space-efficient short depth design makes it easy to install in small media cabinets or places with a lot of cabling. Supporting abundant business and media applications (including file sharing and sync, snapshot protection, virtual machines, cloud storage gateways, video streaming and real-time transcoding) alongside expandable storage capacity and install-on-demand apps, the TS-451DeU is an ideal cost-effective entry-level rackmount NAS.


Available Models

  • TS-451DeU-2G-
    Intel® Celeron® J4025 dual-core 2.0 GHz processor (burst up to 2.9 GHz), 2 GB DDR4 memory (1 x 2 GB)

2.5GbE ports

Up to 5 Gbps transfer speeds can be made by setting port trunking with the two built-in 2.5GbE ports.

M.2 2280 SATA

Dual M.2 2280 SATA 6Gb/s SSD slots allows tool-less SSD installation, and supports SSD caching to increase IOPS performance.


HBS provides comprehensive backup and data recovery; QuDedup deduplicates the data at the source to reduce storage space usage, bandwidth usage, and backup time.

Plex media server

Supports Plex® media server with hardware transcoding for an optimal multimedia experience.

multiple virtual machines

Hosts multiple virtual machines and containers to run a wide range of applications on one NAS device.

 expansion units.

HScale your storage capacity to fit growing data needs by connecting QNAP's expansion units.


Smaller footprint for bigger opportunities

Compared to a traditional 4-bay rackmount NAS, the compact TS-451DeU has a depth of only 11.57 inches (295 mm). This makes the TS-451DeU an excellent choice for smaller racks, and the unused space can be reserved for cabling or ventilation. The TS-451DeU is space-saving for flexible deployment and is especially suitable for multiple locations and applications including offices, audiovisual rooms, and security surveillance recording.

Note: Users can purchase the optional RAIL-B02 rail kit to deploy the TS-451DeU in a 19-inch rack following the ANSI/EIA-RS-310-D standard.

TS-451DeU Racks

Dual-core 2.0 GHz (bursts up to 2.9 GHz) with AES-NI encryption acceleration

The TS-451DeU supports SATA 6 Gb/s drives and features a power-efficient Intel® Celeron® J4025 dual-core 2.0 GHz processor (bursts up to 2.9 GHz). There are two DDR4 SODIMM memory slots with 2 GB DDR4 memory as standard, but can be upgraded up to 8 GB. With Intel® AES-NI encryption engine, the TS-451DeU provides unmatched encryption performance with AES-256 bit encryption acceleration, boosting system performance while ensuring the safety of sensitive business data stored in the NAS.

TS-451DeU 2.5port

Follow the Wi-Fi 6 trends and upgrade to a 2.5GbE NAS

The new-gen Wi-Fi 6 (802.11ax) trend has driven higher bandwidth demands for wired and wireless network connections. The TS-451DeU comes with two 2.5GbE RJ45 LAN ports that allow you to use existing CAT5e cables to upgrade network speeds from 1 Gigabit to 2.5 Gigabit. The dual 2.5GbE ports also support Port Trunking for up to 5 Gbps transmission speeds!

Future-proof your IT infrastructure for high-speed networks

QNAP provides comprehensive, budget-friendly storage and networking solutions, allowing you to easily and flexibly upgrade network environments for bandwidth-hungry applications.

TS-451DeU high-speed networks

A fast 2.5GbE NAS Upgrade computers and servers Add a 5GbE Ethernet port to laptop A switch that supports 2.5GbE+
The TS-451DeU provides two native 2.5GbE ports. PCIe-equipped computers and servers can install QNAP network expansion cards that support 10G/5G/2.5G/1G/100M Multi-Gig Laptops and computers can use a QNAP USB 3.2 Gen 1 to 5GbE adapter that supports N-BASET/Multi-Gig. QNAP 10GbE/NBASE-T switches allow connecting multiple workstations and devices for high-speed collaboration.

SSD caching and auto-tiering optimize application performance

Besides using 2.5-inch SSDs for cache acceleration, the TS-451DeU features two M.2 SSD slots that enable you to install SATA 6Gb/s M.2 SSDs with 2280 form factors (sold separately). Coupled with QNAP's SSD-aware features, the TS-451DeU maximizes performance with high cost-effectiveness.


SSD over-provisioning
SSD cache acceleration Qtier for auto-tiering
Add additional SSD over-provisioning (1% ~60%) to prevent write amplification issues and improve SSD random write speeds and endurance. You can potentially attain enterprise-grade SSD performance levels from consumer-level SSDs! Enables SSD caching for increasing IOPS performance and reducing latency for storage volumes. This feature is perfect for IOPS-demanding applications including databases and virtualization. The TS-451DeU also supports write-only cache to boost write-intensive applications. Qtier technology drives auto-tiered storage with continuous data optimization across high-performance SSDs and high-capacity HDDs based on access frequency. I/O-Aware Qtier can reserve a cache-like space in the SSD tiered to handle burst I/O in real time.

A secure file center supporting regular backups and snapshot protection

The TS-451DeU provides a reliable, flexible backup and disaster recovery solution to simplify routine backup jobs cost-efficiently and with high productivity.

Computer Icon

Windows® and Mac® backup

Use the license-free QNAP NetBak Replicator utility to back up and restore files from Windows® computers. Apple's Time Machine® is supported for backing up Mac® computers.

Camera Icon

Snapshots for Volume & LUN

Block-level snapshots are dependable data protection methods, especially in the face of growing encrypted virus threats. The TS-451DeU supports up to 32 snapshots per volume/LUN, and up to 64 snapshots per NAS. (Upgrading the TS-451DeU to over 4 GB RAM will enable the support for more snapshots versions).

VM Icon

VM backup

The TS-451DeU is perfect for backing up virtual machines, with its high performance, huge storage capacities, integrated virtualization solutions, and snapshot support that records system status any time.

Increased HBS backup efficiency with 2.5GbE connectivity and deduplication

Hybrid Backup Sync (HBS) consolidates backup, restoration and synchronization functions (using RTRR, Rsync, FTP, CIFS/SMB) for easily transferring data in the TS-451DeU to local, remote and cloud storage spaces (including Microsoft One Drive®, Google Drive™, Dropbox®, and more) as a comprehensive data storage and disaster recovery plan. Supporting QuDedup technology that removes duplicate data at the source, HBS reduces backup data size and speeds up future backup tasks. This is also beneficial for accelerating multi-version backups for greater protection against data loss.

HBS backup efficiency

A multimedia server for video streaming and transcoding

The short depth TS-451DeU can be easily placed in a media cabinet. By installing Plex® Media Server from QTS App Center, you can stream media files stored on the TS-451DeU to mobiles and media streaming devices (including DLNA®, Roku®, Amazon Fire TV® and Google Chromecast™). The TS-451DeU also features advanced Intel® UHD Graphics 600 that supports hardware decoding and real-time transcoding, allowing you to convert videos to universal file formats that can be smoothly played on multiple devices. To have greater multimedia enjoyment, Cinema28 empowers your TS-451DeU with multi-zone multimedia management to stream media files to every connected device in different rooms.

Note: PlexPass is required for Plex Media Server hardware transcoding. The TS-451DeU's hardware provides hardware decoding, encoding and transcoding capabilities. However, playback quality may vary due to factors including playback software, file formats, system usage, and available bandwidth.

Optimized collaboration with seamless file sharing and sync

The TS-451DeU centrally stores data and files, and supports SMB/CIFS, AFP and NFS protocols for file sharing across Windows®, Mac®, and Linux®/UNIX® networks. Coupled with the Qsync utility, any file uploaded to the TS-451DeU will be made available for all linked devices (such as computers, laptops and mobiles). You can sync shared folders and team folders for group file sharing to enhance the flexibility of team projects and collaboration. With the myQNAPcloud service, you can easily and securely connect to the TS-451DeU via the Internet for accessing, managing, and sharing NAS files. The Windows AD® and LDAP services enable system administrators to configure user permissions by using an existing Windows AD® server, LDAP server, or the TS-451DeU's built-in LDAP service.

All-in-one server to host virtual machines and containers

Regardless of your virtualization needs, you can count on Virtualization Station and Container Station for complete virtualization support. You can use Network & Virtual Switch to allocate adequate physical network resources to virtual machines, containers, and the NAS to simplify network deployment.

Virtualization Station

Run multiple Windows®, Linux®, UNIX®, and Android™ virtual machines and access them via a web browser or Virtual Network Computing (VNC). Businesses can run virtualized server applications on a single NAS without the need for additional physical servers.

Container Station

Experience LXC and Docker® lightweight virtualization technologies, download apps from the built-in Docker Hub Registry®, import and export containers, and create abundant microservices.

More productivity applications

QVR-Pro icon


Upgrade the TS-451DeU to 4 GB RAM to use QVR Pro - a professional and affordable video surveillance system.

Notification Center

Notification Center

Consolidates all QTS system events, alerts, and notifications for smooth and easy NAS management, keeping you always informed of your NAS status.

Security Counselor

Security Counselor

A security portal for checking weaknesses and providing recommendations for enhancing NAS security. It also integrates anti-virus and anti-malware scanning software.



Backs up or sync files, emails, calendars and contacts from Google™ G Suite and Microsoft® Office 365® into the NAS to safeguard enterprise cloud data.



QNAP's powerful, Google-like search tool for quickly finding specific images, music, videos, documents, and emails by keywords, color, and more search conditions.

Proxy Server-icon

Proxy Server

Use the high-capacity TS-451DeU as a proxy server to efficiently access online resources, save bandwidth, and enhance network security.

Flexible and economical storage expansion

QNAP provides easy storage capacity expansion solutions. Here are several ways to expand your TS-451DeU storage as needed to accommodate data and business growth.


Upgrade RAID Capacity

Hot-swap lower-capacity drives with larger-capacity drives to expand your NAS capacity so it can grow with your business.


Attach Expansion Enclosures

Connect two 4-bay TR-004 RAID expansion enclosures, or one 8-bay TL-D800C/12-bay TL-R1200S-RP USB 3.2 Gen 2 JBOD, and use the QTS Storage & Snapshots Manager to easily handle NAS capacity expansion.


Migrate to a New NAS

Install your NAS hard drives into a larger QNAP NAS and retain all your existing data and configurations.

Extend hardware warranty up to 5 years

The TS-451DeU is backed by a 3-year warranty at no additional cost. You can purchase a warranty extension that extends your warranty coverage up to 5 years.

Hardware Specifications:


CPU Intel® Celeron® J4025 dual-core 2.0 GHz processor (burst up to 2.9 GHz)
CPU Architecture 64-bit x86
Graphic Processors Intel® HD Graphics 600
Floating Point Unit
Encryption Engine (AES-NI)
Hardware-accelerated Transcoding
System Memory 2 GB SO-DIMM DDR4 (1 x 2 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 4 GB (Dual boot OS protection)
Drive Bay 4 x 3.5-inch SATA 6Gb/s, 3Gb/s
The system is shipped without HDD.
Drive Compatibility 3.5-inch SATA hard disk drives
2.5-inch SATA hard disk drives
2.5-inch SATA solid state drives
M.2 SSD Slot 2 x M.2 2280 SATA 6Gb/s slots
SSD Cache Acceleration Support
2.5 Gigabit Ethernet Port (2.5G/1G/100M) 2
Jumbo Frame
USB 2.0 port 2
USB 3.2 Gen 1 port 2
Form Factor 1U Rackmount
LED Indicators Power/Status, LAN, USB, HDD1-2, M.2 SSD 1-2
Buttons Power, Reset
Dimensions (HxWxD) 1.7 x 16.93 x 11.61 inch
Weight (Net) 9.15 lbs
Weight (Gross) 12.76 lbs
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 100W PSU, 100-240V
Power Consumption: HDD Sleep Mode 13.18 W
Power Consumption: Operating Mode, Typical 28.02 W
Fan 3 x 40mm
Sound Level 21.6 db(A)
System Warning Buzzer
Kensington Security Slot
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.

Optional Accessories:



  • DDR type: DDR4(260PIN)
  • Capacity: 2GB
  • Spec: 256M X 16
  • Manufacturer: TRANSCEND
  • Frequency: TS256MSH64V4X
  • Form(PIN): DDR4-2400
  • with ECC Supported: 260PIN
  • Dram Organization: 1.2V
  • Temperature: 256M*64


Rail kit for rackmount models
Note: This rail kit is designed for racks with 25-inch mounting depth. You may need to reserve some space when installing and adjusting the rail kit for racks with 18-inch mounting depth.


Dual 2.5" SATA to 3.5" SATA adapter with RAID support


Dual M.2 SATA SSD to 2.5" SATA adapter with RAID support
Note: Computer SATA ports that do not support 12V (+12V_SATA) are not compatible with the QDA-A2MAR. Please consult your computer vendor for the SATA port voltage output before purchasing the QDA-A2MAR.

Product Views:

Top Right Angle View

Top Right Angle View

Front View

Front View

Top Left Angle View

Top Left Angle View

Left View

Left View

Rear View

Rear View

Right View

Right View

Hot-swappable View

Hot-swappable View

Open Top View

Open Top View



Datasheet for QNAP TS-451DeU is coming soon.


Pricing Notes:

QNAP Products
SMB Storage
QNAP 1U 4-Bay 11.6”-depth NAS, Intel Celeron J4025 dual-core 2.0GHz (up to 2.9GHz), 2GB DDR4 SODIMM RAM (1x2GB, 2 slots, max 8GB total)
SATA 6Gb/s, 2 x 2.5GbE, AES-NI encryption, 2 x USB 3.0, 2 x USB 2.0, hardware transcoding, max 1 TL-D800C or 2 x TR-002/TR-004 expansion unit, single power 100W
Our Price: Request a Quote
QNAP Accessories
Storage Expansion Card
Dual 2.5″ SATA to 3.5″ SATA drive converter/adapter, up to 9.5mm 2.5″ drive height support, hardware RAID 0/1, JBOD, Individual disk modes
Our Price: Request a Quote
Dual M.2 2280 SATA to 2.5″ SATA drive converter/adapter, hardware RAID 0/1, JBOD, Individual disk modes
Our Price: Request a Quote
M.2 2280 SATA 6Gb/s SSD, 256GB MLC, Internal SSD Module
x73, TS-453BT3, TVS-x82, TVS-x82T, TVS-1282T3, TBS-453A, QM2-2S, QM2-2S10G1T
Our Price: Request a Quote
2GB DDR4-2400, SO-DIMM, 260 pin, T0 version
Our Price: Request a Quote
QNAP 4GB DDR4-2666, SO-DIMM, 260 pin, A0 version
For TS-451DeU
Our Price: Request a Quote
Other Accessories
Rail Kit for rackmount models
"TS-431XeU, TS-431XU, TS-431XU-RP, TS-831XU, TS-831XU-RP, TS-1231XU, TS-1231XU-RP, TVS-871U-RP, TVS-1271U-RP, TVS-471U, TVS-471U-RP, TS-463U, TS-463U-RP,TS-863U, TS-863U-RP, TS-1263U, TS-1263U-RP Series, TS-873U, TS-873U-RP, TS-1273U, TS-1273U-RP, TS-x53BU, TS-x32XU series, UX-800U-RP, UX-1200U-RP, TS-853U, TS-853U-RP, TS-1253U, TS-1253U-RP, TS-877XU(-RP), TVS-872XU(-RP), TS-873XU/TS-873XU-RP, TS-883XU(-RP), TS-977XU(-RP), TVS-972XU(-RP), TS-983XU(-RP), TS-1886XU-RP, TS-873AU(-RP), TS-1273AU(-RP), TS-x53DU, TS-x32PXU, TL-R1220Sep-RP, TL-R1620Sep-RP"
Our Price: Request a Quote

Want to build a custom bundle? Contact us!