Short-depth 2U chassis
The 297.4mm-deep design supports deployment where rack depth or cabling space is limited.
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QNAP NAS TS-855EU-8G 8-Bay Intel Atom, 8GB short-depth rackmount NAS
Model # TS-855EU-8G
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SKU: TS-855EU-8G
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8-core short-depth 2U rackmount NAS
QNAP TS-855eU-8G 8-Bay Short-Depth 2.5GbE Rackmount NAS
A diskless eight-bay short-depth 2U NAS with an Intel Atom C5125 eight-core processor, 8GB DDR4 memory, dual 2.5GbE, two M.2 NVMe slots and two PCIe Gen 3 x4 slots.
Diskless 8-bay NASIntel Atom 8-core297.4mm depth3-year manufacturer warranty
What is the QNAP TS-855eU-8G?
The TS-855eU-8G is an eight-bay, 2U short-depth rackmount NAS for file services, backup, restoration, virtual machines and containerised applications. It runs QTS as standard and can be switched to QuTS hero.
8 CoresIntel Atom C5125 at 2.8GHz
8 BaysDiskless hot-swappable SATA storage
2 × M.2PCIe Gen 3 x4 NVMe slots
297.4mmShort-depth 2U chassis
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Short-depth rackmount design for flexible deployment
The 2U chassis measures 297.4mm deep, providing a compact rackmount format for offices, audiovisual rooms and installations that need additional space for cabling.
The optional RAIL-S01 short rail kit is listed for installation in a 19-inch rack following the ANSI/EIA-RS-310-D standard.
- Eight hot-swappable SATA bays support compatible 3.5-inch and 2.5-inch drives.
- The NAS is supplied without hard drives.
- Three 60mm system fans are listed.
Eight-core processing, memory expansion and acceleration
The Intel Atom C5125 processor provides eight cores at 2.8GHz. The system includes 8GB non-ECC SODIMM DDR4 memory and supports up to 64GB using two 32GB modules.
ECC memory is supported, but ECC and non-ECC memory cannot be installed together. AES-NI and Intel QuickAssist Technology are described for encryption, compression and IPsec/SSL cryptography workloads.
- Use a pair of identical DDR4 modules for dual-DIMM configurations.
- The listed maximum concurrent CIFS connection figure is 2,500 with maximum memory.
- QTS is installed as standard and the NAS can be switched to QuTS hero.
Dual 2.5GbE, M.2 NVMe and PCIe expansion
Two built-in 2.5GbE ports support Port Trunking and network fault tolerance. Two M.2 2280 PCIe Gen 3 x4 slots support compatible NVMe SSDs for caching or an SSD storage pool.
Two PCIe Gen 3 x4 slots support compatible 5GbE, 10GbE or 25GbE adapters, QM2 cards or Fibre Channel cards.
- Wake on LAN is supported through the 2.5GbE ports.
- SR-IOV and Jumbo Frame support are listed.
- M.2 SSDs are not hot-swappable.
Storage expansion, virtualisation and performance
The product information lists TL-R1620Sep-RP and TL-R1220Sep-RP JBOD units for adding up to 48 drives. The NAS can centralise virtualisation storage and host virtual machines and containers.
QNAP states planned availability and support for this model up to 2030. Availability and support remain subject to QNAPs product lifecycle.
591MB/s downloadSupplied Windows file-transfer result using two 2.5GbE connections; upload 586MB/s
511MB/s uploadSupplied encrypted transfer result using two 2.5GbE connections; download 510MB/s
3,484MB/s readSupplied SMB result using two optional 25GbE connections; write 2,064MB/s
Performance figures were measured in the stated QNAP Labs environment and require the listed optional hardware and configuration.
Important purchasing and deployment notes
- The NAS is supplied without hard drives; compatible storage must be purchased separately.
- ECC and non-ECC memory cannot be mixed, and identical modules are required for dual-DIMM configurations.
- M.2 SSDs are not hot-swappable, and optional 5GbE, 10GbE or 25GbE requires compatible PCIe hardware.
- QNAP describes planned availability and support for this model through 2030.
Frequently asked questions
What is the QNAP TS-855eU-8G?
It is a diskless eight-bay short-depth 2U NAS with an Intel Atom C5125 eight-core processor, dual 2.5GbE, dual M.2 slots and two PCIe Gen 3 x4 slots.
Does the TS-855eU-8G include hard drives?
No. The product information states that the system is supplied without hard drives.
How deep is the TS-855eU chassis?
The chassis depth is 297.4mm, approximately 11.7 inches.
Which processor is installed?
It uses an Intel Atom C5125 eight-core processor running at 2.8GHz.
How much memory is installed and supported?
This configuration includes 8GB non-ECC DDR4 memory and supports up to 64GB using two 32GB modules.
Does it support ECC memory?
Yes. ECC memory is supported, but ECC and non-ECC memory cannot be installed together.
Which network ports are built in?
It includes two 2.5GbE ports supporting 2.5G, 1G, 100M and 10M speeds.
Can the network connectivity be upgraded?
Yes. Compatible 5GbE, 10GbE and 25GbE network adapters can be installed through the PCIe slots.
Does the TS-855eU include M.2 NVMe slots?
Yes. It includes two M.2 2280 PCIe Gen 3 x4 slots. M.2 SSDs are not hot-swappable.
Can storage capacity be expanded?
Yes. The product information lists TL-R1620Sep-RP and TL-R1220Sep-RP JBOD units for adding up to 48 drives.
Does it support QTS and QuTS hero?
Yes. It runs QTS as standard and can be switched to the ZFS-based QuTS hero operating system.
What warranty applies to the TS-855eU-8G?
This product is covered by a three-year QNAP manufacturer warranty.
(TS-855EU-8G)
Features and highlights
Key capabilities below are organised from the supplied product information for TS-855eU-8G.
Intel Atom eight-core processor
The C5125 processor runs at 2.8GHz and supports AES-NI and Intel QAT capabilities.
Expandable ECC-capable memory
The installed 8GB non-ECC memory can be expanded to 64GB, with ECC supported when non-ECC memory is removed.
Dual 2.5GbE networking
Two multi-gigabit ports support Port Trunking, fault tolerance and Wake on LAN.
Dual M.2 and dual PCIe
Two M.2 Gen 3 x4 slots and two PCIe Gen 3 x4 slots support storage and network expansion.
Virtualisation and capacity expansion
The product information lists VM, container, SR-IOV and JBOD expansion capabilities.
Important: This is a diskless system. ECC and non-ECC memory cannot be mixed, M.2 SSDs are not hot-swappable, and higher-speed networking requires compatible PCIe hardware.
TS-855eU-8G specifications
Specifications below are organised from the supplied QNAP product information for TS-855eU-8G.
Processor and Memory
| CPU | Intel® Atom® C5125 8-core processor, 2.8GHz |
|---|---|
| CPU Architecture | 64-bit x86 |
| Encryption Engine | Yes (AES-NI) |
| Intel QuickAssist Technology | Supported |
| System Memory | 8GB non-ECC SODIMM DDR4 |
| Maximum Memory | 64GB (2 × 32GB) |
| Memory Slots | 2 × SODIMM DDR4; supports ECC memory For a dual-DIMM configuration, use a pair of identical DDR4 modules. ECC and non-ECC memory cannot be used together. |
Storage
| Drive Bays | 8 × 3.5-inch SATA 6Gb/s, 3Gb/s The system is supplied without hard drives. |
|---|---|
| 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 SSDs are not hot-swappable. |
| M.2 Slots | 2 × M.2 2280 (PCIe Gen 3 x4) Compatible with NVMe SSD PCIe Gen 3 and above. |
| SSD Cache Acceleration | Supported |
Networking
| 2.5 Gigabit Ethernet | 2 × 2.5GbE ports (2.5G/1G/100M/10M) |
|---|---|
| 5 Gigabit Ethernet | Optional via a network adapter |
| 10 Gigabit Ethernet | Optional via a network adapter |
| 25 Gigabit Ethernet | Optional via a network adapter |
| Wake on LAN | Yes Supported through the 2.5GbE ports only. |
| Jumbo Frame | Yes |
| SR-IOV | Yes |
Expansion and Connectivity
| PCIe Slots | 2 × PCIe Gen 3 (x4) Slot 1: PCIe Gen 3 (x4) Slot 2: PCIe Gen 3 (x4) Slot 1 card dimensions: 97 × 68.9 × 18.76mm (3.82 × 2.71 × 0.74 inches). Slot 2 card dimensions: 210 × 68.9 × 18.76mm (8.27 × 2.71 × 0.74 inches). |
|---|---|
| USB 3.2 Gen 1 Ports | 4 |
| HDMI Output | Optional via a PCIe graphics card |
Physical Specifications
| Form Factor | 2U short-depth rackmount |
|---|---|
| LED Indicators | HDD 18, Status, LAN, USB, Power |
| Buttons | Power, Reset |
| Dimensions (H × W × D) | 88.6 × 432 × 297.4mm |
| Net Weight | 8.1kg |
| Gross Weight | 9.6kg |
Power and Cooling
| Power Supply Unit | 250W PSU, 100240V |
|---|---|
| Power Consumption Disk Standby | 49.799W |
| Power Consumption Typical Operating Mode | 79.113W Tested fully populated with WD10EFRX hard drives. |
| Fans | 3 × 60mm, 12VDC |
| System Warning | Buzzer |
Operating Environment
| Operating Temperature | 040°C (32104°F) |
|---|---|
| Storage Temperature | -2070°C (-4158°F) |
| Relative Humidity | 595% RH non-condensing, wet bulb: 27°C (80.6°F) |
Warranty and Connections
| Standard Warranty | 3 years |
|---|---|
| Maximum Concurrent CIFS Connections | 2,500 with maximum memory installed |
Operating System and Expansion
| Operating Systems | QTS as standard; can be switched to QuTS hero. |
|---|---|
| Storage Expansion | TL-R1620Sep-RP and TL-R1220Sep-RP JBOD units are listed, adding up to 48 additional drives. |
| Virtualisation | Virtual machines, containers and SR-IOV are supported. |
| Planned Availability | QNAP states planned availability and support up to 2030. |
Important Notes
| Drive status | The system is supplied without hard drives. |
|---|---|
| Memory mixing | ECC and non-ECC memory cannot be used together. |
| M.2 SSD status | M.2 SSDs are not hot-swappable. |
| SKU | TS-855EU-8G |
| Model # | TS-855EU |
| Barcode # | 4711103083307 |
| Brand | QNAP |
| Shipping Weight | 6.0000kg |
3 YearsQNAP manufacturer warranty
3-year QNAP manufacturer warranty
The supplied specifications list a 3-year standard manufacturer warranty for the QNAP TS-855eU-8G.
Warranty coverage, eligibility and claim assessment are subject to QNAPs applicable warranty terms. Please retain your DeviceDeal tax invoice as proof of purchase.
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