8-Bay 2U Short-Depth Rackmount NAS
QNAP TS-855EU-RP-8G Short-Depth Rackmount NAS
An eight-bay short-depth rackmount NAS with an Intel Atom C5125 eight-core processor, 8 GB DDR4 memory, dual 2.5GbE, two M.2 NVMe slots, two PCIe slots and redundant power supplies.
Short-depth rack storage for long-term business deployment
The QNAP TS-855EU-RP-8G fits eight SATA bays, dual M.2 NVMe slots and two PCIe Gen 3 expansion slots into a 297.4 mm-deep 2U chassis. It is designed for file services, backup and restoration, virtual machines and containerised applications, with redundant power and stated product availability up to 2030 supporting continuity-focused deployments.
Key features and benefits
Compact 297.4 mm depth
The short-depth chassis can fit compact racks, audiovisual rooms and installations where rear cabling space is limited.
Redundant power supplies
Two power supply units reduce reliance on a single PSU in business rack deployments.
Dual M.2 NVMe slots
Two M.2 2280 PCIe Gen 3 x4 slots support compatible NVMe SSDs for caching or storage-pool use.
Two PCIe Gen 3 slots
Compatible networking, QM2 and Fibre Channel cards can extend the system as requirements change.
Dual 2.5GbE networking
Two 2.5GbE RJ45 ports support multi-gigabit access and port-trunking options.
QTS or QuTS hero
The platform runs QTS as standard and can switch to the ZFS-based QuTS hero operating system.
Who is this model best for?
A strong choice for
- Short-depth business rack installations
- Centralised file storage and backup
- Virtual machines and containerised applications
- Deployments that value redundant power
- Long-term projects seeking a stated availability window to 2030
Consider another model if you need
- You require 10GbE built in rather than through an adapter
- You need a tower NAS
- You require more than eight drive bays in the main chassis
Key specifications
- Processor
- Intel Atom C5125, 8-core 2.8 GHz
- System memory
- 8 GB non-ECC SODIMM DDR4 (1 × 8 GB)
- Maximum memory
- 64 GB (2 × 32 GB)
- Drive bays
- 8 × 3.5-inch SATA 6Gb/s, 3Gb/s
- Drive compatibility
- 3.5-inch SATA HDD; 2.5-inch SATA HDD; 2.5-inch SATA SSD
- M.2 slots
- 2 × M.2 2280 PCIe Gen 3 x4
- Networking
- 2 × 2.5GbE RJ45
- Expansion
- 2 × PCIe Gen 3 x4 slots
- Dimensions
- 88.6 × 432 × 297.4 mm
- Power supply
- Minimum 300W × 2, 100–240VAC
Full technical specifications
Processor, memory and storage
| CPU | Intel ® Atom® C5125 8-core processor, 2.8GHz |
|---|---|
| CPU Architecture | 64-bit x86 |
| Floating Point Unit | Supported |
| Encryption Engine | Supported (AES-NI) |
| System Memory | 8 GB non-ECC SODIMM DDR4 (1 x 8 GB) |
| Maximum Memory | 64 GB ( 2 x 32 GB) |
| Memory Slot | 2 x SODIMM DDR4 Support ECC memory For dual-DIMM configuration, you must use a pair of identical DDR4 modules. |
| Flash Memory | 5GB (Dual boot OS protection) |
| Drive Bay | 8 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 | Supported (Not supported M.2 SSD) |
| M.2 Slot | 2 x M.2 2280 (PCIe Gen 3 x 4) Compatible with NVMe SSD PCIe Gen 3 and above. Please refer to https://www.qnap.com/compatibility/ for compatibility. |
| SSD Cache Acceleration Support | Supported |
| SR-IOV | Supported |
| Max. Number of Concurrent Connections (CIFS) - with Max. Memory | 2500 |
Network, ports and expansion
| 2.5 Gigabit Ethernet Port (2.5G/1G/100M) | 2 (2.5G/1G/100M/10M) |
|---|---|
| 5 Gigabit Ethernet Port (5G/2.5G/1G/100M) | Optional via a network adapter |
| 10 Gigabit Ethernet Port | Optional via a network adapter |
| 25 Gigabit Ethernet Port | Optional via a network adapter |
| Wake on LAN (WOL) | Supported Only the 2.5GbE port |
| Jumbo Frame | Supported |
| PCIe Slot | 2 x PCIe Gen3 (x4) Slot 1: PCIe Gen 3 (x4) Slot 2: PCIe Gen 3 (x4) Card dimensions for PCIe slot 1:97 x 68.9x 18.76 mm / 3.82 x 2.71 x 0.74 inches. Card dimensions for PCIe slot 2:210 x 68.9 x 18.76 mm / 8.27 x 2.71 x 0.74 inches. |
| USB 3.2 Gen 1 port | 4 |
| HDMI™ Output | Optional via a PCIe graphics card |
Physical, environmental and power
| Form Factor | 2U Short Depth Rackmount |
|---|---|
| LED Indicators | HDD 1-8, Status, LAN, USB, Power |
| Buttons | Power, Reset |
| Dimensions (HxWxD) | 88.6 × 432 × 297.4 mm |
| Weight (Net) | 9.47 kg |
| Weight (Gross) | 10.94 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 | Minimum 300W (x2) PSU, 100-240VAC |
| Power Consumption: Operating Mode, Typical | 78.73 W Tested fully populated with WD10EFRX hard drives. |
| Fan | 3 x 60mm, 12VDC |
| System Warning | Buzzer |
Frequently asked questions about the TS-855EU-RP-8G
What is the QNAP TS-855EU-RP-8G?
It is an eight-bay 2U short-depth rackmount NAS with dual 2.5GbE, two M.2 NVMe slots, two PCIe slots and redundant power.
Which processor does the TS-855EU-RP-8G use?
The TS-855EU-RP-8G uses an Intel Atom C5125 eight-core 2.8 GHz processor.
How much memory is included with the TS-855EU-RP-8G?
The TS-855EU-RP-8G includes 8 GB non-ECC SODIMM DDR4 memory as one 8 GB module, with a stated maximum of 64 GB.
How many drive bays does the TS-855EU-RP-8G have?
It has eight 3.5-inch SATA 6Gb/s, 3Gb/s drive bays.
Which drive types are supported by the TS-855EU-RP-8G?
It supports 3.5-inch SATA HDDs, 2.5-inch SATA HDDs and 2.5-inch SATA SSDs.
Which network ports are built into the TS-855EU-RP-8G?
It includes two 2.5GbE RJ45 ports; 5GbE, 10GbE and 25GbE are optional through compatible network adapters.
What expansion options does the TS-855EU-RP-8G provide?
It provides two M.2 2280 PCIe Gen 3 x4 slots and two PCIe Gen 3 x4 expansion slots.
What form factor is the TS-855EU-RP-8G?
It is a 2U short-depth rackmount NAS with redundant power supplies.
What are the dimensions of the TS-855EU-RP-8G?
Its stated dimensions are 88.6 × 432 × 297.4 mm.
How long is the TS-855EU-RP-8G expected to remain available?
The product description states extended availability and QNAP support up to 2030.
Important information
The system is shipped without hard drives.
M.2 SSDs are not hot-swappable.
The stated 78.73 W operating figure was tested with WD10EFRX drives fully populated.
Check drive, M.2 SSD, expansion-card and JBOD compatibility before purchase.
