8-Bay Hybrid Tower NAS
QNAP TS-855X-8G Hybrid Storage NAS
An eight-bay hybrid tower NAS with six 3.5-inch bays, two 2.5-inch bays, an eight-core Intel Atom C5125 processor, 8 GB DDR4 memory, dual 2.5GbE and built-in 10GBASE-T.
Hybrid storage with 10GbE and long-term availability
The QNAP TS-855X-8G combines six HDD bays, two dedicated 2.5-inch SSD bays and two M.2 NVMe slots with built-in 10GBASE-T and dual 2.5GbE connectivity. Two PCIe Gen 3 slots, QTS and QuTS hero options, virtualisation support and stated availability up to 2030 suit growing business storage and long-term deployment planning.
Key features and benefits
Hybrid eight-bay design
Six 3.5-inch bays and two 2.5-inch SSD bays balance storage capacity and flash-based acceleration.
Built-in 10GbE and 2.5GbE
One 10GBASE-T port and two 2.5GbE RJ45 ports support fast access, backup and restoration traffic.
Two 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
Install compatible network, QM2 or Fibre Channel cards within the stated card dimensions.
Virtual machines and containers
The feature set supports virtual machines, containerised applications and SR-IOV.
Long-term deployment planning
The product description states availability and QNAP support for an extended period up to 2030.
Who is this model best for?
A strong choice for
- Business file storage and backup
- Hybrid HDD and SSD storage
- Virtual machines and containers
- 10GbE-connected workgroups
- Long-term projects seeking matching NAS models
Consider another model if you need
- You require a rackmount chassis
- You need an all-flash platform
- You require more than 8 GB memory installed initially
Key specifications
- Processor
- Intel Atom C5125, 8-core 2.8 GHz
- System memory
- 8 GB non-ECC UDIMM DDR4 (1 × 8 GB)
- Maximum memory
- 128 GB (4 × 32 GB)
- Drive bays
- 6 × 3.5-inch + 2 × 2.5-inch SATA
- Drive compatibility
- 3.5-inch SATA HDD; 2.5-inch SATA SSD
- M.2 slots
- 2 × M.2 2280 PCIe Gen 3 x4
- Networking
- 1 × 10GBASE-T; 2 × 2.5GbE RJ45
- Expansion
- 2 × PCIe Gen 3 x4 slots
- Dimensions
- 225 × 292.9 × 319.8 mm
- Power supply
- 250W, 100–240V
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 UDIMM DDR4 (1 x 8 GB) |
| Maximum Memory | 128 GB (4 x 32 GB) |
| Memory Slot | 4 x U-DIMM DDR4 Support ECC memory |
| Flash Memory | 5GB (Dual boot OS protection) |
| Drive Bay | 6 x 3.5-inch + 2 x 2.5-inch SATA 6Gb/s, 3Gb/s |
| Drive Compatibility | 3.5-inch bays: 3.5-inch SATA hard disk drives 2.5-inch SATA solid state drives 2.5-inch bays: 2.5-inch SATA solid state drives |
| Hot-swappable | Supported The following are not hot-swappable: M.2 SSDs, SSD cache drives, SSDs using PCIe expansion slots. |
| M.2 Slot | 2 x M.2 2280 PCIe Gen 3 x4 slots The M.2 SSD is not included as standard. M.2 SSD operations can easily generate excessive heat. It is recommended to install a heatsink on the M.2 SSD. |
| 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) |
|---|---|
| 10 Gigabit Ethernet Port | 1 x 10GBASE-T |
| 25 Gigabit Ethernet Port | Optional via PCIe expansion card |
| Wake on LAN (WOL) | Supported Only the 2.5GbE port |
| Jumbo Frame | Supported |
| PCIe Slot | 2 Slot 1: PCIe Gen 3 x4 Slot 2: PCIe Gen 3 x4 Card dimensions for PCIe slot 1:260 x 111.15 x 18.76 mm / 10.25 x 4.38 x 0.74 inches Card dimensions for PCIe slot 2:150 x 68.9 x 18.76 mm / 5.90 x 2.71 x 0.74 inches. |
| USB 2.0 port | 1 |
| USB 3.2 Gen 1 port | 3 |
Physical, environmental and power
| Form Factor | Tower |
|---|---|
| LED Indicators | Power/Status, LAN, USB, HDD1-6, SSD 1-2, M.2 SSD 1-2 |
| Buttons | Power, Reset, USB Auto Copy |
| Dimensions (HxWxD) | 225 × 292.9 × 319.8 mm Dimensions do not include foot pad (foot pad may be up to 30mm / 1.18 inches high depending on model) |
| Weight (Net) | 10.04 kg |
| Weight (Gross) | 10.04 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 | 250W PSU, 100~240V |
| Power Consumption: Operating Mode, Typical | 86.96 W Tested with drives fully populated. |
| Fan | System fan: 2 x 80mm, 12VDC CPU fan: 1 x 90mm, 12VDC |
| System Warning | Buzzer |
| Kensington Security Slot | Supported |
Software and system features
| Other Interfaces | Kensington security slot |
|---|
Frequently asked questions about the TS-855X-8G
What is the QNAP TS-855X-8G?
It is an eight-bay hybrid tower NAS with six 3.5-inch bays, two 2.5-inch bays and built-in 10GbE plus 2.5GbE networking.
Which processor does the TS-855X-8G use?
It uses an Intel Atom C5125 eight-core 2.8 GHz processor.
How much memory is included?
The TS-855X-8G includes 8 GB non-ECC UDIMM DDR4 memory as one 8 GB module.
What is the maximum memory capacity?
The stated maximum is 128 GB across four UDIMM DDR4 slots, and ECC memory support is listed.
How are the drive bays arranged?
It has six 3.5-inch SATA bays and two 2.5-inch SATA bays.
Are M.2 SSDs included?
No. The two M.2 slots are included, but M.2 SSDs are not supplied as standard.
Which network ports are built in?
It includes one 10GBASE-T port and two 2.5GbE RJ45 ports.
How many PCIe slots are available?
The TS-855X-8G provides two PCIe Gen 3 x4 slots.
Can storage capacity be expanded?
Yes. The description states support for connecting JBOD units and adding up to 48 additional drive capacity.
What are its dimensions?
The stated dimensions are 225 × 292.9 × 319.8 mm, excluding the foot pads.
Important information
M.2 SSDs are not included as standard, and a heatsink is recommended for M.2 SSD operation.
M.2 SSDs, SSD cache drives and SSDs installed through PCIe expansion are not hot-swappable.
The typical 86.96 W operating figure was tested with drives fully populated.
Confirm drive, M.2 SSD, JBOD and expansion-card compatibility before purchase.
