QNAP 8-Bay Short-Depth Rackmount NAS Review (2026): A Spec-Based Look

What stands out

• Intel Atom C5125 8-core processor running at 2.8GHz
• 8GB SODIMM DDR4 RAM expandable to 64GB with ECC
• Dual 2.5GbE network ports for accelerated file sharing
• Dual M.2 PCIe Gen 3 x4 NVMe SSD slots
• Two PCIe Gen 3 x4 slots for expansion cards

Who it fits

Key specs explained for this NAS

Processor: Intel Atom C5125

This eight-core processor runs at 2.8GHz. You get reliable performance for managing multiple tasks and simultaneous file access. It handles background processes efficiently without slowing down your primary storage operations. This spec suits users who need steady throughput for shared drives rather than raw computational power for heavy video editing.

RAM Capacity: 8GB SODIMM DDR4

The system includes 8GB of DDR4 memory, which can expand up to 64GB with ECC support. Adequate RAM ensures smooth operation of the operating system and applications. You benefit from faster data caching and better multitasking capabilities. Compare this with other NAS models to ensure you have enough memory for your planned virtual machines or container services.

Network Connectivity: Dual 2.5GbE

Two 2.5 Gigabit Ethernet ports provide faster data transfer speeds than standard 1GbE connections. You can accelerate file sharing across teams and streamline large file transfers. This setup allows for link aggregation or separate network isolation. Check your current network infrastructure to ensure your switches and cables support 2.5GbE speeds for maximum benefit.

M.2 NVMe Slots: Dual PCIe Gen 3 x4

The unit features two slots for NVMe SSDs via PCIe Gen 3 x4. You can use these for cache acceleration to speed up frequent read/write operations or create dedicated SSD storage pools. This enhances overall system responsiveness. Consider the IOPS of the SSDs you plan to install, as the slot speed supports high-performance drives for demanding workloads.

Rackmount Design and Build

The QNAP TS-855eU-RP-8G-US is a 2U rackmount NAS with a short-depth form factor. According to the listing, the chassis measures 21 inches in width, 8 inches in height, and 23 inches in length. It weighs 9 pounds. The unit is available in black or gray finishes. This compact footprint allows you to install it in standard server racks without consuming excessive horizontal space. The short depth is a practical choice for tight rack environments where rear cable management requires limited clearance.

The design prioritizes density and expansion. You get eight drive bays for storage capacity. The unit includes dual PCIe Gen 3 x4 slots. These slots allow you to install additional network adapters, QM2 cards, or Fibre Channel cards. This modular layout supports customized network speeds and application performance. You can also add dual M.2 PCIe Gen 3 x4 NVMe SSD slots for cache acceleration or SSD storage pools. The system uses an Intel Atom C5125 processor and 8GB of DDR4 RAM, which scales up to 64GB with ECC support. This hardware configuration fits well in environments where you need reliable, steady throughput for shared drives and background processes. The build focuses on efficient rack integration and expandable connectivity rather than desktop aesthetics.

Setup and everyday use

Setting up this rackmount unit requires a standard server environment. You need space for its 21 by 23 inch footprint and 8 inch height. The short-depth design helps fit it into tighter racks without blocking rear airflow. You install your own hard drives into the eight bays. The system ships diskless, so you must source storage separately. Memory is handled by a single 8GB SODIMM DDR4 stick. You can upgrade this to 64GB with ECC support if your workload demands more. Network connectivity starts with dual 2.5GbE ports. This allows you to split traffic or bond connections for higher throughput. You can also add PCIe cards for Fibre Channel or additional networking. Daily use involves managing files across teams. The Intel Atom C5125 processor handles concurrent requests efficiently. You can enable cache acceleration using the two M.2 NVMe slots. This speeds up frequent access to large files. The unit supports backup tasks for Google Workspace and Microsoft 365 via Boxafe. This feature runs in the background, protecting cloud data without impacting daily performance. The black or gray chassis blends into most server rooms. You monitor system status through the web interface. The hardware is built for continuous operation in a data center setting. It does not require a display or keyboard. You manage everything remotely. This setup suits users who need dense storage in a standard rack. It is not designed for desktop placement. The short depth is the key advantage here. It saves valuable rack space while maintaining full eight-bay capacity.

Before You Buy This Rackmount NAS

You must purchase your own hard drives, as this unit ships diskless. Ensure your rack has adequate depth for the 23-inch length, even with the short-depth design. Verify that your power infrastructure supports the dual redundant power supplies required for this 2U form factor. You will need to install your own RAM if you plan to exceed the included 8GB, keeping ECC compatibility in mind. Check that your network switches support 2.5GbE to fully utilize the dual ports. This model sits alongside other dense storage options in our 1 product guide, offering a specialized solution for users who prioritize rack integration and high-speed networking over desktop convenience. Regular maintenance involves monitoring drive health and ensuring proper airflow within the rack enclosure to maintain optimal operating temperatures for the Intel Atom processor.

Check before you buy

• Buy compatible hard drives separately since the unit is diskless
• Confirm your rack has sufficient depth for the 23-inch chassis
• Verify power supply requirements for dual redundant units
• Ensure network switches support 2.5GbE connections
• Check RAM upgrade options if you need more than 8GB

The product at a glance

1

QNAP 8-Bay Short-Depth Rackmount NAS

Best for: Server racks needing 8 bays and 2.5GbE

Drive Bays

8 Bay

Network Connectivity

Dual 2.5GbE

Processor

Intel Atom C5125

RAM Capacity

8GB SODIMM DDR4

M.2 NVMe Slots

Dual M.2 PCIe Gen 3 x4 NVMe SSD slots

Included Storage

Diskless

View on Amazon: QNAP 8-Bay Short-Depth Rackmount NAS Affiliate link

The QNAP TS-855eU-RP-8G-US is an 8-bay rackmount NAS designed for dense storage and high-speed networking. It features an Intel Atom C5125 processor, 8GB of DDR4 RAM, and dual 2.5GbE ports. The chassis offers a short depth to fit tighter server racks. You will appreciate the dual M.2 NVMe slots for caching and the dual PCIe slots for expansion. This unit suits teams needing reliable file sharing and large transfer speeds.

Pros

• Intel Atom C5125 8-core processor
• Dual 2.5GbE network ports
• Dual M.2 NVMe SSD slots
• Dual PCIe Gen 3 expansion slots

Cons

• 2U form factor requires rack space
• Only 8GB RAM included
• Sold diskless without drives

Good fit if

• You need an 8-bay storage solution
• You require dual 2.5GbE connectivity
• You want PCIe expansion options

Skip if

• You prefer a desktop form factor
• You need more than 8 drive bays
• You want pre-installed hard drives

Verdict: QNAP 8-Bay Short-Depth Rackmount NAS provides robust networking and expansion for server environments. It fits users who need dense storage with flexible upgrade paths.

Specifications side by side

Frequently asked questions

See also

• qnap ts 855eu rp 8g us 8 bay high speed alternatives
• best QNAP desktop network attached storages
• singer singer s0100 high speed review
• pexmor 36lbs thrust 8 speed review