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The compact and feature-rich TS-451DeU combines an Intel® Celeron® dual-core 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.
Up to 5 Gbps transfer speeds can be made by setting port trunking with the two built-in 2.5GbE ports.
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.
Supports Plex® media server with hardware transcoding for an optimal multimedia experience.
Hosts multiple virtual machines and containers to run a wide range of applications on one NAS device.
Scale your storage capacity to fit growing data needs by connecting QNAP’s expansion units.
Intel® Celeron® J4025 2-core/2-thread processor, burst up to 2.9 GHz, 2 GB SODIMM DDR4 (1 x 2 GB)
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 kit to deploy the TS-451DeU in a 19-inch rack following the ANSI/EIA-RS-310-D standard.
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.
Tested in QNAP Labs. Figures may vary by environment.
Test Environment:
NAS: TS-451DeU-2G
OS: QTS 4.4.2, MTU-9000
Volume type: Qtier, RAID 5: 4 x Seagate 1TB ES.3 HDD + RAID 1: 2 x Samsung 1TB M.2 860 EVO SSD
Client PC: Intel® Core TM i7-6700 3.40GHz CPU; 32GB RAM; Intel X550 NIC, MTU-9000; Windows® 10 Pro
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!
QNAP provides comprehensive, budget-friendly storage and networking solutions, allowing you to easily and flexibly upgrade network environments for bandwidth-hungry applications.
| 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 that support 10G/5G/2.5G/1G/100M Multi-Gig. | Laptops and computers can use a that supports N-BASET/Multi-Gig. | allow connecting multiple workstations and devices for high-speed collaboration. |
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.
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SSD over-provisioning
(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. |
The TS-451DeU provides a reliable, flexible backup and disaster recovery solution to simplify routine backup jobs cost-efficiently and with high productivity.
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.
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).
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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.
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.
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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.
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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.
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.
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With Hyper Data Protector, the TS-451DeU becomes an agentless backup tool for unlimited VMware® vSphere and Microsoft® Hyper-V VM backup. Hyper Data Protector features incremental backup, global deduplication, backup scheduling and recovery compression that provides you with a cost-effective and reliable disaster recovery plan, ensuring 24/7 operation of your services.
Notes: QNAP NAS must be running QTS version 4.3.6 or later
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.
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.
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Experience LXC and Docker® lightweight virtualization technologies, download apps from the built-in Docker Hub Registry®, import and export containers, and create abundant microservices.
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Upgrade the TS-451DeU to 4 GB RAM to use QVR Pro - a professional and affordable video surveillance system.
Consolidates all QTS system events, alerts, and notifications for smooth and easy NAS management, keeping you always informed of your NAS status.
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™ Workspace and Microsoft® Office 365® into the NAS to safeguard enterprise cloud data.
QNAP’s powerful, Google-like search tool quickly finds images, music, videos, documents, and emails by keyword, color, and other search conditions.
Use the high-capacity TS-451DeU as a proxy server to efficiently access online resources, save bandwidth, and enhance network security.
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.
Hot-swap lower-capacity drives with larger-capacity drives to expand your NAS capacity so it can grow with your business.
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.
Install your NAS hard drives into a larger QNAP NAS and retain all your existing data and configurations.
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.
High-performance 8-core 10GbE NAS for deploying hybrid-infrastructure storage and high-speed virtualization applications
Combat present & emerging virus threats
Powerful 10GbE-ready hybrid storage with PCIe Gen 4 expandability, supporting QuTS hero or QTS operating system
Build a personal private cloud & home multimedia center with a built-in NPU to boost AI-powered face recognition
Add two M.2 NVMe SSDs to your NAS with a PCIe 3.0 expansion card
Quad-core 2.5GbE NAS for professionals, supporting PCIe expansion for 10 Gbps or M.2 SSDs to accelerate applications
High-performance 8-core 10GbE NAS for deploying hybrid-infrastructure storage and high-speed virtualization applications
Combat present & emerging virus threats
Powerful 10GbE-ready hybrid storage with PCIe Gen 4 expandability, supporting QuTS hero or QTS operating system
Build a personal private cloud & home multimedia center with a built-in NPU to boost AI-powered face recognition
Add two M.2 NVMe SSDs to your NAS with a PCIe 3.0 expansion card
Quad-core 2.5GbE NAS for professionals, supporting PCIe expansion for 10 Gbps or M.2 SSDs to accelerate applications
40x40x25mm fan, 12V, 4PIN
100W Delta power supply
Dimension (L × W × H): 18.40 × 14.30 × 4.00 (cm)
Weight: 0.27 (kg)
Screw pack for 2.5' HDD / SSD intallation, 96 pieces, Flat head machine screw
Dimension (L × W × H): 0.10 × 11.80 × 12.80 (cm)
Weight: 0.01 (kg)
Screw pack for 3.5' HDD intallation, 96 pieces, Flat head machine screw
Dimension (L × W × H): 0.10 × 11.80 × 12.80 (cm)
Weight: 0.03 (kg)
1U rack mounting ears kit with screws, one pair for left and right each, black.
Dimension (L × W × H): 18.50 × 14.00 × 4.00 (cm)
Weight: 0.05 (kg)
Black HDD tray with black flat head machine screw x6 for 2.5' HDD & silver flat head machine screw x8 for 3.5' HDD
Dimension (L × W × H): 18.50 × 14.00 × 4.00 (cm)
Weight: 0.20 (kg)
new rail kit for new 1U & 2U NAS: TVS-471U, 1253U, etc
Dimension (L × W × H): 73.80 × 10.00 × 7.00 (cm)
Weight: 2.48 (kg)
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. For installation details, click .
Heatsink for M.2 SSD module,15*15MM, Black, self adhesive.8 pcs
Dimension (L × W × H): 1.50 × 1.50 × 1.50 (cm)
Weight: 0.05 (kg)
Dual 2.5' SATA drive to single 3.5' SATA drive adapter with RAID 0/1, JBOD, individual modes
Dimension (L × W × H): 19.50 × 11.20 × 4.40 (cm)
Weight: 0.22 (kg)
Dual M.2 2280 SATA drive to single 2.5' SATA drive adapter with RAID 0/1, JBOD, individual modes
Dimension (L × W × H): 19.50 × 11.20 × 4.40 (cm)
Weight: 0.22 (kg)
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.
M.2 2280 SATA 6Gb/s SSD, 256GB, Internal SSD Module
Dimension (L × W × H): 16.70 × 2.70 × 6.80 (cm)
Weight: 0.04 (kg)
M.2 2280 SATA 6Gb/s SSD, 256GB, Internal SSD Module
Dimension (L × W × H): 2.70 × 17.80 × 6.80 (cm)
Weight: 0.05 (kg)
Dual port 2.5GbE 4-speed Network card
Dimension (L × W × H): 8.13 × 6.89 × 2.52 (cm)
Weight: 0.23 (kg)
DDR type: DDR4(260PIN)
Capacity: 2GB
Spec: 256M X 16
Frequency: DDR4-2400
Form(PIN): 260PIN
Power Supply: 1.2V
Dram Organization: 256M*64
Temperature: 0℃~85℃
Environmental Regulation: RoHS
DDR type: DDR4(260PIN)
Capacity: 4GB
Spec: 512M X 16
Frequency: DDR4-2666
Form(PIN): 260PIN
Power Supply: 1.2V
Dram Organization: 512M*64
Temperature: 0℃~85℃
Environmental Regulation: RoHS
| CPU | Intel® Celeron® J4025 2-core/2-thread processor, burst up to 2.9 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 | 2 GB SODIMM DDR4 (1 x 2 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.
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| Flash Memory | 4GB (Dual boot OS protection) |
| Drive Bay |
4 x 3.5-inch SATA 6Gb/s, 3Gb/s
The system is shipped without HDD.
For the HDD compatibility list, please visit |
| 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 Slot | 2 x M.2 2280 SATA 6Gb/s slots |
| SSD Cache Acceleration Support | YES |
| 2.5 Gigabit Ethernet Port (2.5G/1G/100M) | 2 (2.5G/1G/100M/10M) |
| Wake on LAN (WOL) | YES |
| Jumbo Frame | YES |
| USB 2.0 port | 2 |
| USB 3.2 Gen 1 port | 2 |
| Form Factor | 1U Short Depth Rackmount |
| LED Indicators | Power/Status, LAN, USB, HDD1-2, M.2 SSD 1-2 |
| Buttons | Power, Reset |
| Dimensions (HxWxD) | 44 × 430 × 295 mm |
| Weight (Net) | 4.15 kg |
| Weight (Gross) | 5.79 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 | 100W PSU, 100-240V |
| Power Consumption: HDD Sleep Mode | 13.18 W |
| Power Consumption: Operating Mode, Typical |
28.02 W
Tested with drives fully populated.
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| Fan | 3 x 40mm |
| System Warning | Buzzer |
| Kensington Security Slot | YES |
| Max. Number of Concurrent Connections (CIFS) - with Max. Memory | 1500 |
