Qnap TS-855eU-8G, 2U Short-depth Rackmount Nas With 8-core Computing Power, Intel ® Atom® C5125 8-core Processor, 2.8GHz, 8 Gb Sodimm DDR4 (1x 8 Gb), 2 Yrs Wt TS-855eU-8G
SKU
401808
Brand
MPN
TS-855eU-8G
Warranty
Standard Manufacturer's Warranty
$3,281.00
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CPU:Intel ® Atom® C5125 8-core processor, 2.8GHz
CPU Architecture: 64-bit x86
Floating Point Unit:Y
Encryption Engine: (AES-NI)
System Memory:8 GB SODIMM DDR4 (1 x 8 GB)
Maximum Memory:64 GB ( 2 x 32 GB)
Memory Slot:2 x SODIMM DDR4
Support ECC memory:Y
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.
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
M.2 Slot:2 x M.2 2280 (PCIe Gen 3 x 4)
SSD Cache Acceleration Support:Y
SR-IOV:Y
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)
Only the 2.5GbE port
Jumbo Frame
PCIe Slot 2 x PCIe Gen
CPU Architecture: 64-bit x86
Floating Point Unit:Y
Encryption Engine: (AES-NI)
System Memory:8 GB SODIMM DDR4 (1 x 8 GB)
Maximum Memory:64 GB ( 2 x 32 GB)
Memory Slot:2 x SODIMM DDR4
Support ECC memory:Y
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.
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
M.2 Slot:2 x M.2 2280 (PCIe Gen 3 x 4)
SSD Cache Acceleration Support:Y
SR-IOV:Y
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)
Only the 2.5GbE port
Jumbo Frame
PCIe Slot 2 x PCIe Gen
| CPU | Intel® Atom® C5125, octa-core (8 cores), 2.8 GHz |
|---|---|
| SKU | TS-855eU-8G |
| Brand | QNAP |
| Model | TS-855eU-8G |
| Notes | System shipped diskless (no HDDs/SSDs installed) Supports expansion via QNAP expansion units, cloud storage, or migration Some vendors list slightly different software revision numbers; check vendor firmware/OS release notes for exact version support |
| Weight | Net: 17.86 lb (8.10 kg) Gross / Packaged: 21.16 lb (9.60 kg) |
| Cooling | 3 x 60 mm fans, 12 VDC |
| Category | Storage |
| Warranty | 3 years standard (extendable to 5 years) |
| M.2 Slots | 2 x M.2 2280 (PCIe Gen3 x4) NVMe |
| USB Ports | 4 x USB 3.2 Gen 1 (USB 3.0) |
| Dimensions | Depth: 11.71 in (297.4 mm) Width: 17.01 in (432 mm) Height: 3.49 in (88.6 mm) |
| Drive Bays | 8 x 3.5" (supports 2.5" drives) |
| PCIe Slots | 2 x PCIe Gen3 x4 |
| Description | The QNAP TS-855eU-8G is a compact 2U short-depth rackmount NAS designed for space-constrained racks, AV cabinets and network closets. Powered by an Intel® Atom® C5125 8-core 2.8 GHz processor and 8GB DDR4 SODIMM memory (user-upgradable to 64GB, ECC supported), it supports up to eight 2.5"/3.5" SATA drives plus two M.2 2280 NVMe PCIe Gen3 x4 SSDs for caching or SSD pools. Dual 2.5GbE RJ45 ports accelerate file sharing and virtualization workloads, while two PCIe Gen3 x4 slots enable network/storage expansion (5/10/25GbE, QM2, Fibre Channel, GPU). The system supports QTS and QuTS hero operating systems, comprehensive backup/snapshot/security features (including ransomware protection, QuFirewall, QVPN, QuWAN SD-WAN), virtualization and container hosting, Qtier auto-tiering, and QVR surveillance solutions. Compact dimensions and a 250W PSU make it suitable for business deployments requiring high performance in a small footprint. Includes Ethernet cable, power cord, drive screws and quick installation guide. |
| Form Factor | 2U short-depth rackmount |
| HDMI Output | Optional via PCIe graphics card |
| Wake on LAN | Supported (only on 2.5GbE port) |
| Flash Memory | 5 GB (dual-boot OS protection) |
| Key Features | Short 11.7" (297.4 mm) depth for compact rack/cabinet deployment Dual M.2 NVMe for SSD caching or storage pools Two 2.5GbE ports with port trunking support PCIe expandability for 5/10/25GbE, QM2, Fibre Channel, GPU Intel AES-NI and Intel QuickAssist Technology (QAT) for encryption offloading Qtier auto-tiering Comprehensive backup solutions (Hybrid Backup Sync, Boxafe for Google Workspace/Microsoft 365, SaaS backup, etc.) Snapshot-based ransomware protection, QuFirewall, QVPN, Security Center |
| Memory Slots | 2 x SODIMM DDR4 |
| Power Supply | 1 x 250W (100-240V) |
| Sub-Category | Network Attached Storage (NAS) |
| Product Title | QNAP TS-855eU-8G 8-Bay 2U Short-Depth Rackmount NAS (Intel Atom C5125, 8GB, Dual 2.5GbE) |
| Ethernet Ports | 2 x 2.5GbE RJ45 (2.5G/1G/100M) |
| Maximum Memory | 64 GB (supports ECC memory when installed) |
| CPU Architecture | 64-bit x86 |
| M.2 Hot-Swappable | No (M.2 not hot-swappable) |
| Memory (Standard) | 8GB DDR4 SODIMM (non-ECC by default) |
| Operating Systems | QTS (vendor reports QTS 5.x - examples: 5.0.1, 5.2.8) QuTS hero (vendor reports h5.x - example: h5.2.8) |
| Power Consumption | Disk Standby: 49.799 W (vendor reported) Operating (typical, with WD10EFRX HDDs): 79.113 W (vendor reported) |
| Relative Humidity | 5-95% RH non-condensing |
| Storage Temperature | -20 to 70 °C (-4 to 158 °F) |
| Included Accessories | Ethernet cable x1 Power cord x1 Flat head screws x32 (for 3.5" HDD) Flat head screws x24 (for 2.5" HDD) Quick Installation Guide |
| Operating Temperature | 0 to 40 °C (32 to 104 °F) |
| RAID Levels Supported | RAID 0 RAID 1 RAID 5 RAID 6 RAID 10 RAID 50 RAID 60 Triple Mirror Triple Parity JBOD |
| Supported Drive Types | 3.5-inch SATA HDD (SATA III / SATA II) 2.5-inch SATA HDD 2.5-inch SATA SSD |
| Maximum Shared Folders | QTS: 512 QuTS hero: 256 |
| Regulatory / Standards | SNMP Ethernet network standards |
| Supported Clients / Protocols | Windows (incl. Server) macOS Linux/UNIX SMB/CIFS AFP NFS FTP/FTPS/SFTP WebDAV iSCSI |
| Virtualization / Certifications | VMware Hyper-V Citrix Veeam Virtualization Station Container Station |
| Maximum Concurrent CIFS Connections | Up to 2500 (with maximum memory, vendor-reported) |
QNAP TS-855eU-8G, 2U short-depth rackmount NAS with 8-core computing power, Intel ® Atom® C5125 8-core processor, 2.8GHz, 8 GB SODIMM DDR4 (1x 8 GB), 2 Yrs WT
