Hybrid eight-bay storage
Six 3.5-inch bays and two dedicated 2.5-inch SSD bays support flexible storage layouts.
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QNAP TS-855X-8G, 8-Bay NAS, Intel Atom C5125 8-core processor, 2.8GHz
Model # TS-855X-8G
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SKU: TS-855X-8G
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8-core tower NAS with built-in 10GbE
QNAP TS-855X-8G 8-Bay NAS with 10GBASE-T and Dual 2.5GbE
An eight-bay tower NAS with an Intel Atom C5125 eight-core processor, 8GB DDR4 memory, one 10GBASE-T port, dual 2.5GbE, dual M.2 NVMe and two PCIe Gen 3 x4 slots.
6 HDD + 2 SSD baysBuilt-in 10GBASE-TUp to 128GB memory3-year manufacturer warranty
What is the QNAP TS-855X-8G?
The TS-855X-8G is a tower NAS for high-capacity storage, backup, file serving and virtualisation. It combines six 3.5-inch bays, two dedicated 2.5-inch SSD bays, built-in 10GBASE-T and dual 2.5GbE networking with M.2 and PCIe expansion.
8 CoresIntel Atom C5125 at 2.8GHz
6 + 2 BaysHDD and dedicated SSD bays
10GBASE-TPlus dual 2.5GbE RJ45
Up to 128GBFour DDR4 UDIMM slots
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Flexible eight-bay storage configuration
Six 3.5-inch SATA bays support compatible hard drives or 2.5-inch SATA SSDs, while two dedicated 2.5-inch SATA bays support solid state drives.
Two M.2 2280 PCIe Gen 3 x4 slots support compatible NVMe SSDs for cache acceleration or an SSD storage pool.
- M.2 SSDs are not included as standard.
- M.2 SSDs and SSDs installed through PCIe expansion are not hot-swappable.
- A QNAP or third-party heatsink is recommended for M.2 SSDs.
Eight-core processing and memory up to 128GB
The Intel Atom C5125 processor provides eight cores at 2.8GHz. The system includes 8GB non-ECC UDIMM DDR4 memory and supports up to 128GB across four slots.
ECC memory is supported, but ECC and non-ECC memory cannot be mixed. AES-NI and Intel QuickAssist Technology are supplied for encryption, compression and IPsec/SSL workloads.
- SR-IOV support is listed.
- The listed maximum concurrent CIFS connection figure is 2,500 with maximum memory.
- Use memory modules with identical specifications when installing multiple modules.
Built-in 10GBASE-T and multi-gigabit expansion
One 10GBASE-T port supports 10G, 5G, 2.5G, 1G and 100M speeds. Two additional 2.5GbE ports support SMB Multichannel for up to 5Gbps combined bandwidth in the product information.
Two PCIe Gen 3 x4 slots support compatible 5GbE, 10GbE or 25GbE adapters and other expansion cards.
1,181MB/s read/writeSupplied SMB result using the built-in 10GbE connection
3,505MB/s readSupplied SMB result using two optional 25GbE connections; write 2,288MB/s
589MB/s downloadSupplied Windows result using two 2.5GbE connections; upload 586MB/s
Performance figures were measured in the stated QNAP Labs environments and may vary. Optional 25GbE requires compatible PCIe hardware.
QTS, QuTS hero and virtualisation support
The NAS runs QTS as standard and can be switched to the ZFS-based QuTS hero operating system according to storage requirements.
The product information lists VMware Ready, Microsoft Hyper-V, Citrix and Veeam Ready certifications.
- QNAP states planned availability and support for this model up to 2030.
- QTS and QuTS hero operating-system options are listed for this model.
- Backup support is described for PCs, Macs, virtual machines, containers, cloud data and SaaS data.
Important purchasing and deployment notes
- Confirm the configured package and whether storage drives are included before purchase.
- ECC and non-ECC memory cannot be mixed.
- M.2 SSDs are not included as standard and are not hot-swappable.
- Published performance figures depend on the stated QNAP laboratory test configuration.
Frequently asked questions
What is the QNAP TS-855X-8G?
It is an eight-bay tower NAS with an Intel Atom C5125 eight-core processor, built-in 10GBASE-T, dual 2.5GbE, dual M.2 slots and two PCIe slots.
How are the eight drive bays arranged?
It has six 3.5-inch SATA bays and two dedicated 2.5-inch SATA SSD bays.
Which processor is installed?
It uses an Intel Atom C5125 eight-core processor running at 2.8GHz.
How much memory is installed and supported?
The system includes 8GB non-ECC DDR4 memory and supports up to 128GB across four UDIMM slots.
Does it support ECC memory?
Yes. ECC memory is supported, but ECC and non-ECC memory cannot be mixed.
Which network ports are built in?
It includes one 10GBASE-T port and two 2.5GbE RJ45 ports.
Can the dual 2.5GbE ports be combined?
Yes. The product information describes SMB Multichannel for up to 5Gbps combined bandwidth.
Does the TS-855X support M.2 NVMe SSDs?
Yes. It includes two M.2 2280 PCIe Gen 3 x4 slots. M.2 SSDs are not included as standard and are not hot-swappable.
Can 25GbE be added?
Yes. Optional 25GbE connectivity can be added through a compatible PCIe expansion card.
Can it run QuTS hero?
Yes. It runs QTS as standard and can be switched to the ZFS-based QuTS hero operating system.
Which virtualisation certifications are listed?
The product information lists VMware Ready, Microsoft Hyper-V, Citrix and Veeam Ready.
What warranty applies to the TS-855X-8G?
This product is covered by a three-year QNAP manufacturer warranty.
(TS-855X-8G)
Features and highlights
Key capabilities below are organised from the supplied product information for TS-855X-8G.
Built-in 10GBASE-T
One multi-gigabit 10GBASE-T port is paired with two 2.5GbE RJ45 interfaces.
Intel Atom eight-core processing
The C5125 processor runs at 2.8GHz and supports AES-NI and Intel QAT capabilities.
Memory capacity up to 128GB
Four UDIMM slots support non-ECC or ECC memory, but the two memory types cannot be mixed.
Dual M.2 and dual PCIe
Built-in NVMe slots and PCIe Gen 3 x4 slots support storage and network expansion.
QTS or QuTS hero
The NAS can use QTS or switch to the ZFS-based QuTS hero environment.
Important: Confirm the configured package for drive inclusion. M.2 SSDs are not included or hot-swappable, and ECC and non-ECC memory cannot be mixed.
TS-855X-8G specifications
Specifications below are organised from the supplied QNAP product information for TS-855X-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 UDIMM DDR4 |
| Maximum Memory | 128GB (4 x 32GB) |
| Memory Slots | 4 x U-DIMM DDR4 Supports ECC memory ECC and non-ECC memory cannot be mixed. |
Storage
| Drive Bays | 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 | Yes M.2 SSDs, SSD cache drives and SSDs installed through PCIe expansion slots are not hot-swappable. |
| M.2 Slots | 2 x M.2 2280 PCIe Gen 3 x4 slots M.2 SSDs are not included as standard. A heatsink from QNAP or a third-party provider is recommended because M.2 SSDs can generate excessive heat. |
| SSD Cache Acceleration | Yes |
| SR-IOV | Yes |
Networking
| 2.5 Gigabit Ethernet | 2 x 2.5GbE ports (2.5G/1G/100M/10M) |
|---|---|
| 10 Gigabit Ethernet | 1 x 10GBASE-T (10G/5G/2.5G/1G/100M) |
| 25 Gigabit Ethernet | Optional via PCIe expansion card |
| Wake on LAN | Yes Supported through the 2.5GbE ports only. |
| Jumbo Frame | Yes |
Expansion and Connectivity
| PCIe Slots | 2 Slot 1: PCIe Gen 3 x4 Slot 2: PCIe Gen 3 x4 Slot 1 card dimensions: 260 x 111.15 x 18.76mm (10.25 x 4.38 x 0.74 inches). Slot 2 card dimensions: 150 x 68.9 x 18.76mm (5.90 x 2.71 x 0.74 inches). |
|---|---|
| USB 2.0 Ports | 1 |
| USB 3.2 Gen 1 Ports | 3 |
| Other Interfaces | Kensington security slot |
Physical Specifications
| Form Factor | Tower |
|---|---|
| LED Indicators | Power/Status, LAN, USB, HDD 16, SSD 12, M.2 SSD 12 |
| Buttons | Power, Reset, USB Auto Copy |
| Dimensions (H x W x D) | 225 x 292.9 x 319.8mm Dimensions do not include the foot pad, which may be up to 30mm (1.18 inches) high depending on model. |
| Net Weight | 10.04kg |
| Gross Weight | 10.04kg |
Power and Cooling
| Power Supply Unit | 250W PSU, 100240V |
|---|---|
| Typical Operating Power Consumption | 86.96W Tested with drives fully populated. |
| Fans | System fan: 2 x 80mm, 12VDC CPU fan: 1 x 90mm, 12VDC |
| System Warning | Buzzer |
| Kensington Security Slot | Yes |
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 Deployment
| Operating Systems | QTS as standard; can be switched to QuTS hero. |
|---|---|
| Virtualisation Certifications | VMware Ready, Microsoft Hyper-V, Citrix and Veeam Ready are listed. |
| Planned Availability | QNAP states planned availability and support up to 2030. |
Important Notes
| Drive inclusion | Confirm the configured package for drive inclusion. |
|---|---|
| Memory mixing | ECC and non-ECC memory cannot be mixed. |
| M.2 SSD status | M.2 SSDs are not included as standard and are not hot-swappable. |
| SKU | TS-855X-8G |
| Model # | TS-855X |
| Barcode # | 4711103084007 |
| Brand | QNAP |
| Shipping Weight | 5.8000kg |
| Shipping Width | 0.280m |
| Shipping Height | 0.280m |
| Shipping Length | 0.280m |
3 YearsQNAP manufacturer warranty
3-year QNAP manufacturer warranty
The supplied specifications list a 3-year standard manufacturer warranty for the QNAP TS-855X-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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