Best Rackmount NAS Devices in 2026: 15 Picks Ranked by Specs
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Finding the best rackmount network attached storages requires matching physical dimensions and interface specs to your rack infrastructure. We compared 15 models based strictly on published specifications. The QNAP TR-004U leads because its 4-bay capacity and 4.41-pound chassis offer practical expansion for existing QNAP ecosystems. Each pick prioritizes measurable attributes like bay count, processor cores, and network connectivity. This guide helps you decide which device fits your space and performance needs.
Our top pick: QNAP TR-004U 4 Bay Rackmount NAS.
Quick picks
The best fit for you
- You need to expand existing QNAP NAS storage QNAP TR-004U 4 Bay Rackmount NAS The QNAP TR-004U is a practical expansion unit with four SATA drive bays.
- You require large capacity for virtualization workloads Asustor Lockerstor 12-Bay Rackmount NAS The Asustor Lockerstor features a quad-core processor and supports up to 128GB RAM.
- You want high capacity with included drives BUFFALO TeraStation 51220RH 12-Bay 240TB The BUFFALO TeraStation 51220RH comes with 240TB of pre-installed storage in a 12-bay chassis.
- You need 10GbE networking with redundant power QNAP 8-Bay Short-Depth Rackmount NAS The Asustor 16 Pro offers 10GbE connectivity and an 8-core AMD Ryzen processor.
Our 15 picks
QNAP TR-004U 4 Bay Rackmount NAS
Best for: expanding existing QNAP NAS storage
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4 Bay
- Network Connectivity
- USB 3.0 Type-C
- Dimensions
- 21.3 × 16.5 × 7.87 inches
- Weight
- 4.41 pounds
The QNAP TR-004U is a 4-bay rackmount NAS expansion unit designed to add storage capacity to your existing QNAP system. It supports up to four SATA drives and includes a USB 3.0 Type-C port for faster data transfers. You can configure RAID groups using dip switches or the Storage & Snapshots Manager app. Its lockable drive trays enhance security. This unit serves as direct-attached storage or a hardware RAID expansion.
Pros
- Supports up to four SATA drives
- Includes USB 3.0 Type-C port
- Lockable hard drive trays
- Dip switch for RAID configuration
Cons
- Requires a host QNAP NAS for full software features
- No built-in Ethernet ports for independent network access
- Limited to SATA drive compatibility
Good fit if
- You need to expand storage on an existing QNAP NAS
- You require lockable drive trays for physical security
- You want to use the unit as direct-attached storage
Skip if
- You need a standalone NAS without a host system
- You require independent network connectivity via Ethernet
- You prefer a full 1U rackmount height
Verdict: QNAP TR-004U 4 Bay Rackmount NAS is a practical expansion unit for users already invested in the QNAP ecosystem who need additional SATA drive bays or direct-attached storage capabilities.
QNAP 4 Bay 1U Rackmount SATA JBOD
Best for: expanding storage for QNAP NAS systems
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4 Bay
- Included Storage
- Diskless
- Hardware Interface
- SATA
- Dimensions
- 21.3 × 16.3 × 7.05 inches
The QNAP TL-R400S is a 1U rackmount SATA 6Gbps JBOD enclosure designed for storage expansion. It holds four 3.5-inch drives and connects via a PCIe SATA card and SFF-8088 cable. This diskless unit suits users needing extra space for QNAP NAS, Windows, or Linux systems. Its compact 1U form factor fits standard racks efficiently.
Pros
- Four 3.5-inch drive bays for SATA 6Gb/s storage
- Compact 1U rackmount form factor saves space
- Includes PCIe SATA card and SFF-8088 cable
- Compatible with QNAP NAS and Linux servers
Cons
- Diskless; drives sold separately
- Limited to SATA 6Gbps interface speeds
- No mention of RAID controller or hot-swap support
Good fit if
- You need extra SATA storage for an existing QNAP NAS
- You require a compact 1U expansion for your rack
- You use Windows or Linux servers needing JBOD storage
Skip if
- You need a complete NAS with built-in operating system
- You require RAID functionality without external controllers
- You need NVMe or SAS drive support
Verdict: QNAP 4 Bay 1U Rackmount SATA JBOD provides reliable expansion for users with existing QNAP or Linux setups. It fits well in tight rack spaces but requires separate drive purchases and lacks advanced RAID features.
Asustor Lockerstor 12-Bay Rackmount NAS
Best for: large-capacity virtualization and business rack storage
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 12 Bay
- Processor
- Intel Atom C3538
- RAM Capacity
- 8 GB DDR4-2133
- Included Storage
- Diskless
- Network Connectivity
- 5GbE, 2.5GbE
This 2U rackmount NAS provides 12 drive bays for high-capacity network storage. It runs on a 2.1GHz quad-core Intel Atom C3538 processor and comes with 8GB of DDR4 memory that you can expand up to 128GB. With two 2.5GbE ports, two Gigabit Ethernet ports, and an open PCIe slot for an optional 10GbE card, you get versatile networking for virtualization environments and container workloads across your business network.
Pros
- 12 drive bays in a 2U rackmount form factor
- DDR4 RAM expandable up to 128GB across four slots
- Two 2.5GbE and two 1GbE ports supporting aggregation
- PCIe slot available for 10GbE network expansion
- Certified support for VMware, Citrix, Hyper-V, and Docker
Cons
- Ships diskless without pre-installed storage drives
- Built-in networking tops out at 2.5GbE without a PCIe add-in card
- Base configuration includes 8GB RAM out of 128GB capacity
Good fit if
- You need 12 drive bays in a 2U rackmount configuration.
- You plan to run virtual machines or containers requiring RAM expansion up to 128GB.
- You want multi-Gigabit Ethernet with the option to add 10GbE via PCIe.
Skip if
- You need native 10GbE ports ready out of the box without buying an expansion card.
- You want a rackmount unit that comes pre-loaded with storage drives.
Verdict: Asustor Lockerstor 12-Bay 2U Rackmount NAS delivers 12 bays of raw capacity and memory expansion up to 128GB for demanding network deployments. Its quad-core processor and dual 2.5GbE ports make it a capable platform for virtualization and business storage.
Synology 4-Bay Compact Rackmount NAS
Best for: Compact rackmount setups needing network redundancy
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4-Bay
- Network Connectivity
- Dual 1GbE
- Included Storage
- Diskless
- Dimensions
- 21 × 15.8 × 5.45 inches
The Synology RackStation RS422+ is a 4-bay rackmount NAS designed for space-constrained environments. It offers sequential read speeds over 601 MB/s and write speeds over 516 MB/s. The unit features dual 1GbE ports for network failover and load balancing. Its depth is just 327.5 mm with handles installed. You can add 10GbE connectivity via plug-and-play modules. This diskless model suits users needing reliable, compact storage.
Pros
- Sequential read throughput exceeds 601 MB/s
- Compact depth of 327.5 mm with handles
- Dual 1GbE ports support load balancing
- Supports 10GbE upgrade modules
Cons
- Diskless enclosure requires separate drive purchase
- Limited to 1GbE base connectivity
- Only 4 drive bays available
Good fit if
- You need a compact rackmount solution under 1U depth
- You require network redundancy with dual 1GbE ports
- You plan to upgrade to 10GbE later
Skip if
- You need pre-installed storage drives
- You require 10GbE connectivity out of the box
- You need more than 4 drive bays
Verdict: Synology RackStation 4-Bay Rackmount NAS provides high throughput in a small footprint. It fits users who prioritize space efficiency and network flexibility over included storage.
BUFFALO TeraStation 5420RN 4-Bay 32TB
Best for: Secure 4-bay rackmount storage with 10GbE
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4-Bay
- Network Connectivity
- Native 10GbE port
- Included Storage
- 32TB (4x8TB)
- RAID Support
- RAID 5, RAID 6, RAID 0
- Dimensions
- 7.9 × 23 × 21.3 inches
This is a 4-bay rackmount NAS with 32 TB of pre-installed storage. It features a native 10GbE port for fast transfers. The system includes 256-bit drive encryption and two-factor authentication. Snapshots allow for quick data recovery. It supports cloud sync with Dropbox and Azure. This unit suits businesses needing secure, high-capacity storage in a rack format.
Pros
- Includes 4x8TB drives for 32 TB total capacity
- Native 10GbE port for high-speed data transfers
- 256-bit drive encryption and two-factor authentication
- Snapshots for instant data backup and recovery
- Cloud integration with Dropbox, Amazon S3, and Azure
Cons
- Only 4 bays limit expansion compared to 12-bay peers
- No mention of dual power supplies for redundancy
- Closed system limits third-party app flexibility
Good fit if
- You need a fully stocked 4-bay rackmount solution
- You require native 10GbE connectivity
- You prioritize built-in encryption and snapshots
Skip if
- You need more than 4 drive bays
- You require redundant power supplies
- You want open-source software flexibility
Verdict: BUFFALO TeraStation 5420RN 4-Bay 32TB is a secure, ready-to-use rackmount NAS for teams needing 10GbE speeds and snapshot protection without manual drive installation.
BUFFALO TeraStation 51220RH 12-Bay 240TB
Best for: High-capacity enterprise storage with included drives
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 12-Bay
- Network Connectivity
- 10GbE
- Included Storage
- 240TB (12x20TB)
- RAID Support
- RAID 0, 6
- Dimensions
- 29 × 3.4 × 18.9 inches
The BUFFALO TeraStation 51220RH is a 12-bay rackmount NAS that ships fully populated with twelve 20TB drives for 240TB of total storage. It features native 10GbE connectivity for fast data transfers and includes enterprise-grade security like 256-bit drive encryption and two-factor authentication. This unit is designed for heavy data loads and offers snapshot capabilities for rapid recovery. It suits organizations needing high capacity and robust data protection in a rackmount form factor.
Pros
- Includes twelve 20TB drives for 240TB total capacity
- Native 10GbE port for high-speed file transfers
- 256-bit drive encryption and two-factor authentication
- Snapshot feature for instant data backup and recovery
Cons
- Large physical footprint at 18.9 inches high and 29 inches long
- Heavy weight of 55.4 pounds requires sturdy rack mounting
- Closed system limits flexible software customization compared to open-source alternatives
Good fit if
- You need a high-capacity 12-bay solution with drives included
- You require native 10GbE connectivity for fast data access
- You prioritize enterprise security features like encryption and snapshots
Skip if
- You have limited rack space and need a compact 1U unit
- You prefer open-source operating systems for greater control
- You want a lightweight unit for easy mobility
Verdict: BUFFALO TeraStation 51220RH 12-Bay 240TB is a robust, high-capacity rackmount NAS that fits enterprises needing immediate storage with 10GbE speeds and strong security. It is ideal for organizations with the physical space and rack infrastructure to support its large, heavy chassis.
BUFFALO TeraStation 12-Bay 80TB Rackmount NAS
Best for: Enterprise teams needing 10GbE and PCIe slots
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 12-Bay
- Network Connectivity
- 4x 10GbE
- Processor
- Intel Xeon
- Included Storage
- 80TB (4x20TB)
- Dimensions
- 29 × 3.5 × 18.9 inches
View on Amazon: BUFFALO TeraStation 12-Bay 80TB Rackmount NAS
This 12-bay rackmount NAS includes four 20TB drives for 80TB of total storage. It uses an Intel Xeon processor and offers two PCIe Gen 4 slots for expansion. You get four native 10GbE ports for high-speed data transfer. The system supports Btrfs snapshots for quick recovery. It also features 256-bit drive encryption and two-factor authentication for secure enterprise storage.
Pros
- Includes four 20TB hard drives for 80TB capacity
- Four native 10GbE network ports
- Intel Xeon processor for enterprise workloads
- Two PCIe Gen 4x8 expansion slots
Cons
- Heavier at 54.2 pounds
- Larger footprint at 29 inches long
- Limited to 10GbE rather than 25GbE
Good fit if
- You need high-speed 10GbE connectivity
- You want pre-installed enterprise drives
- You require PCIe expansion for SSDs
Skip if
- You need 25GbE or higher speeds
- You prefer a lighter unit
- You want a smaller 1U form factor
Verdict: BUFFALO TeraStation 12-Bay 80TB Rackmount NAS suits teams needing 10GbE speeds and PCIe expansion. It is ideal for enterprises requiring pre-installed high-capacity drives and robust data protection features.
BUFFALO TeraStation 4-Bay 8TB Rackmount NAS
Best for: users needing included drives and 2.5GbE
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4-Bay
- Network Connectivity
- 2.5GbE
- Included Storage
- 8TB (4x2TB)
- RAID Support
- RAID 0, 5, 6
The BUFFALO TeraStation Essentials is a 4-bay rackmount NAS with 8TB of storage. It includes four 2TB drives pre-configured in RAID 5. The unit features a native 2.5GbE port for fast transfers. It offers 256-bit drive encryption and cloud sync options. This device suits users needing a simple, secure, and ready-to-use rackmount solution.
Pros
- Includes four 2TB hard drives for immediate use
- Native 2.5GbE port for high-speed file transfers
- 256-bit drive encryption for data security
- Supports cloud sync with Dropbox, Azure, and OneDrive
Cons
- Only one 2.5GbE port limits network redundancy
- Quad-core CPU is not listed in specifications
- No mention of dual power supply units
Good fit if
- You want a rackmount NAS with drives included
- You need 2.5GbE connectivity without cable upgrades
- You require 256-bit drive encryption
Skip if
- You need multiple network ports for link aggregation
- You require a high-performance multi-core processor
- You need dual power supplies for redundancy
Verdict: BUFFALO TeraStation 4-Bay 8TB Rackmount NAS is a practical entry for teams needing pre-configured storage with 2.5GbE speeds. It fits users who prioritize included drives and encryption over advanced hardware specs.
QNAP 8-Bay Short-Depth Rackmount NAS
Best for: compact racks needing 8-bay PCIe expansion
- Form Factor
- Rackmount (what this guide is about)
- 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
This 2U short-depth rackmount NAS gives you eight drive bays powered by an 8-core 2.8GHz Intel Atom C5125 processor and 8GB of DDR4 memory. Built-in dual 2.5GbE network ports handle fast file transfers across local devices. You also get dual M.2 PCIe Gen 3 x4 NVMe slots for caching and two PCIe Gen 3 x4 expansion slots. It suits you if you need dense local storage and expansion in compact rack setups.
Pros
- 8-core 2.8GHz Intel Atom C5125 processor
- Dual M.2 PCIe Gen 3 x4 NVMe SSD slots for SSD cache or pools
- Two PCIe Gen 3 x4 slots for add-in cards
- Memory expands up to 64GB with ECC support
- Dual 2.5GbE Ethernet connectivity
Cons
- Ships diskless without pre-installed storage drives
- Lacks built-in 10GbE networking without PCIe expansion cards
Good fit if
- You need an 8-bay enclosure designed for short-depth rack installations.
- You plan to add M.2 NVMe SSD cache alongside mechanical storage drives.
- You require memory upgrade headroom up to 64GB ECC RAM.
Skip if
- You require native 10GbE network ports without using expansion slots.
- You need storage drives bundled directly with the enclosure.
Verdict: QNAP 8-Bay Short-Depth 2U Rackmount NAS provides an 8-core Intel Atom CPU, dual M.2 NVMe slots, and dual PCIe expansion bays in a short-depth chassis. It delivers capable hardware headroom and memory expansion up to 64GB ECC for demanding local environments.
QNAP TL-R1600PES 16-Bay Rackmount JBOD
Best for: massive SATA storage expansion in small racks
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 16 Bay
- Dimensions
- 1 × 13 × 24 inches
This QNAP TL-R1600PES is a 16-bay rackmount JBOD enclosure designed for petabyte-level expansion. It uses Mini-SAS HD ports to connect to a host NAS, supporting SATA 6Gb/s drives. The 3U short-depth chassis fits small media cabinets. Redundant power supplies ensure continuity. You need this if you require massive, flexible storage scaling without managing individual drive controllers.
Pros
- Supports 16 x 3.5-inch SATA 6Gb/s drives
- Redundant power supplies for service continuity
- Short-depth 3U design for small cabinets
- Mini-SAS HD expansion ports
Cons
- Requires separate rail kit for installation
- No built-in NAS controller or OS
- Limited to SATA 6Gb/s drive speeds
Good fit if
- You need to expand a QNAP NAS with massive capacity
- You have space constraints requiring a short-depth chassis
- You require redundant power for critical storage
Skip if
- You need an all-in-one NAS with its own operating system
- You cannot purchase a separate rail kit
- You require NVMe or SAS drive support
Verdict: QNAP TL-R1600PES 16-Bay Rackmount JBOD is a dense storage expander for users who already have a host NAS and need to add 16 drive bays in a compact 3U footprint.
Asustor Lockerstor 16 Pro 16-Bay Rackmount NAS
Best for: High-capacity storage with redundant power
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 16-Bay
- Network Connectivity
- Dual 10GbE, Dual 1GbE
- Processor
- AMD Ryzen 7 Pro 7745
- RAM Capacity
- 16GB ECC DDR5
- Included Storage
- Diskless
View on Amazon: Asustor Lockerstor 16 Pro 16-Bay Rackmount NAS
This 16-bay rackmount NAS uses an 8-core AMD Ryzen 7 Pro 7745 processor and 16 GB of ECC DDR5 memory. It includes dual 10GbE and dual Gigabit Ethernet ports for high-speed connectivity. The unit features dual redundant 80 PLUS Platinum power supplies and PCIe 5.0 slots. It is designed for users needing substantial storage capacity and robust processing power in a 2U form factor.
Pros
- 16 drive bays for large storage arrays
- AMD Ryzen 7 Pro 7745 8-core CPU
- Dual 10GbE and dual Gigabit Ethernet ports
- Dual redundant 80 PLUS Platinum power supplies
Cons
- Heavier build at 33.7 pounds
- Larger footprint than 1U short-depth models
- Diskless enclosure requires separate drive purchase
Good fit if
- You need maximum drive capacity in a single unit
- You require redundant power supplies for critical data
- You want PCIe 5.0 expansion for SSDs
Skip if
- You need a 1U short-depth chassis
- You want a lighter device under 20 pounds
- You prefer included storage drives
Verdict: Asustor 16-Bay Rackmount NAS offers extensive storage and powerful processing for users who prioritize capacity and redundancy over compact size.
QNAP 4-Bay 10GbE Rackmount NAS
Best for: 10GbE networking and RAM expansion
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4 Bay
- Network Connectivity
- Two 10GbE SFP+, Two 2.5 GbE RJ45
- Processor
- AnnapurnaLabs Alpine AL324 1.7GHz
- RAM Capacity
- 2GB UDIMM DDR4
This QNAP 4-bay rackmount NAS features an AnnapurnaLabs Alpine AL324 quad-core 1.7GHz processor. It includes 2GB of upgradable DDR4 RAM and two 10GbE SFP+ ports alongside two 2.5 GbE RJ45 ports. The unit offers four USB 3.2 Gen 1 ports and one PCIe slot. It suits users needing high-speed networking and expandable storage in a compact rack form factor.
Pros
- Two 10GbE SFP+ network ports
- Two 2.5 GbE RJ45 ports
- Upgradable 2GB DDR4 RAM
- Quad-core 1.7GHz processor
Cons
- Only 2GB base RAM
- Single power supply option
- Limited to 4 drive bays
Good fit if
- You need 10GbE connectivity
- You want expandable RAM
- You require a 4-bay rackmount unit
Skip if
- You need more than 4 bays
- You require redundant power
- You need higher base RAM
Verdict: QNAP 4-Bay Rackmount NAS delivers essential high-speed networking and expandable memory for compact rack deployments. It fits users prioritizing 10GbE ports and upgradable RAM over higher drive counts.
QNAP 8-Bay Rackmount NAS
Best for: 8-bay rack storage with 2.5GbE
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 8 Bay
- Network Connectivity
- Dual 2.5GbE
- Processor
- AMD Ryzen Embedded V1500B
- RAM Capacity
- 4GB DDR4
This is an 8-bay rackmount NAS from QNAP. It uses an AMD Ryzen Embedded V1500B 4-core processor running at 2.2 GHz. The system includes 4GB of DDR4 RAM, which can expand to 64GB. It features dual 2.5GbE ports for faster file transfers. You also get multiple USB 3.2 Gen 2 ports for external storage. This unit is designed for teams needing reliable shared storage in a rack environment.
Pros
- 8-bay capacity for high storage density
- AMD Ryzen Embedded V1500B 4-core 2.2 GHz processor
- Dual 2.5GbE network ports
- RAM expandable up to 64GB
Cons
- Base RAM is only 4GB
- No redundant power supply included in this variant
- Single power supply limits uptime reliability
Good fit if
- You need 8 drive bays in a rack
- You want dual 2.5GbE connectivity
- You plan to upgrade RAM later
Skip if
- You require redundant power
- You need more than 8 bays
- You want pre-installed high-end RAM
Verdict: QNAP 8-Bay Rackmount NAS suits users who need a compact 8-bay solution with dual 2.5GbE ports and room for RAM upgrades.
QNAP 4-Bay Rackmount NAS with 2.5GbE
Best for: Small teams needing fast LAN transfers and cloud backup
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4 Bay
- Network Connectivity
- Dual 2.5GbE
- Processor
- Intel Quad-core
- RAM Capacity
- 8GB RAM
- M.2 NVMe Slots
- Optional via PCIe
This is a 4-bay rackmount NAS designed for teams needing faster local transfers. It uses an Intel quad-core CPU that bursts to 2.9 GHz and includes 8GB of RAM. Dual 2.5GbE ports accelerate file sharing across devices. You get multiple USB 3.2 ports for connecting fast external drives. It also supports backing up Google Workspace and Microsoft 365 data. This unit suits users who prioritize network speed over raw capacity.
Pros
- Intel quad-core CPU with 2.9 GHz burst speed
- Dual 2.5GbE network ports for faster LAN transfers
- 8GB RAM for improved multitasking
- Multiple USB 3.2 Gen 2 ports for external storage
- Built-in Boxafe for cloud backup
Cons
- Only 4 drive bays limit total storage capacity
- No 10GbE ports for ultra-high speed networking
- Single PCIe slot restricts expansion options
Good fit if
- You need faster local network speeds than standard Gigabit
- You want to back up Microsoft 365 or Google Workspace
- You have a small team with moderate storage needs
Skip if
- You require more than 4 drive bays
- You need 10GbE networking for large file transfers
- You want to expand with multiple PCIe cards
Verdict: QNAP 4-Bay Rackmount NAS with 2.5GbE offers a balanced mix of processing power and network speed for small offices. It fits users who value faster LAN transfers and cloud backup features over high storage density.
QNAP 4-Bay 1U Short Depth Rackmount NAS
Best for: Small teams needing fast network speeds
- Form Factor
- Rackmount (what this guide is about)
- Drive Bays
- 4-Bay
- Network Connectivity
- Dual 2.5GbE
- Processor
- Intel Quad-core
- RAM Capacity
- 8GB
- M.2 NVMe Slots
- 2 slots
This 4-bay 1U rackmount NAS features an Intel quad-core CPU with 8GB of RAM. It includes dual 2.5GbE ports for faster network transfers and two M.2 NVMe slots for cache or storage. The unit supports 4K media playback via HDMI. It suits users needing compact rack space with strong processing power for small teams.
Pros
- Intel Quad-core CPU burst up to 2.9 GHz
- 8GB RAM capacity
- Dual 2.5GbE network ports
- Two M.2 NVMe SSD slots
Cons
- Only 4 drive bays limit large capacity needs
- HDMI 1.4b output caps at 4K 30Hz
- No mention of included hard drives
Good fit if
- You need a compact 1U rackmount solution
- You require dual 2.5GbE network connectivity
- You want NVMe SSD caching options
Skip if
- You need more than 4 drive bays
- You require 10GbE network ports
- You want pre-installed hard drives
Verdict: QNAP TS-464eU 4-Bay Rackmount NAS delivers solid performance for small offices needing 2.5GbE speeds and NVMe support in a 1U form factor. It is ideal for users who prioritize network speed and caching over raw drive count.
Specifications side by side
| Spec | QNAP TR-004U 4 Bay Rackmount NAS | QNAP 4 Bay 1U Rackmount SATA JBOD | Asustor Lockerstor 12-Bay Rackmount NAS | Synology 4-Bay Compact Rackmount NAS | BUFFALO TeraStation 5420RN 4-Bay 32TB | BUFFALO TeraStation 51220RH 12-Bay 240TB | BUFFALO TeraStation 12-Bay 80TB Rackmount NAS | BUFFALO TeraStation 4-Bay 8TB Rackmount NAS | QNAP 8-Bay Short-Depth Rackmount NAS | QNAP TL-R1600PES 16-Bay Rackmount JBOD | Asustor Lockerstor 16 Pro 16-Bay Rackmount NAS | QNAP 4-Bay 10GbE Rackmount NAS | QNAP 8-Bay Rackmount NAS | QNAP 4-Bay Rackmount NAS with 2.5GbE | QNAP 4-Bay 1U Short Depth Rackmount NAS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Drive Bays | 4 Bay | 4 Bay | 12 Bay | 4-Bay | 4-Bay | 12-Bay | 12-Bay | 4-Bay | 8 Bay | 16 Bay | 16-Bay | 4 Bay | 8 Bay | 4 Bay | 4-Bay |
| Network Connectivity | USB 3.0 Type-C | not specified | not specified | Dual 1GbE | Native 10GbE port | 10GbE | 4x 10GbE | 2.5GbE | Dual 2.5GbE | not specified | Dual 10GbE, Dual 1GbE | Two 10GbE SFP+, Two 2.5 GbE RJ45 | Dual 2.5GbE | Dual 2.5GbE | Dual 2.5GbE |
| Processor | not specified | not specified | Intel Atom C3538 | not specified | not specified | not specified | Intel Xeon | not specified | Intel Atom C5125 | not specified | AMD Ryzen 7 Pro 7745 | AnnapurnaLabs Alpine AL324 1.7GHz | AMD Ryzen Embedded V1500B | Intel Quad-core | Intel Quad-core |
| RAM Capacity | not specified | not specified | 8 GB DDR4-2133 | not specified | not specified | not specified | not specified | not specified | 8GB SODIMM DDR4 | not specified | 16GB ECC DDR5 | 2GB UDIMM DDR4 | 4GB DDR4 | 8GB RAM | 8GB |
| M.2 NVMe Slots | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Dual M.2 PCIe Gen 3 x4 NVMe SSD slots | not specified | not specified | not specified | not specified | Optional via PCIe | 2 slots |
| Included Storage | not specified | Diskless | Diskless | Diskless | 32TB (4x8TB) | 240TB (12x20TB) | 80TB (4x20TB) | 8TB (4x2TB) | Diskless | not specified | Diskless | not specified | not specified | not specified | not specified |
| RAID Support | not specified | not specified | not specified | not specified | RAID 5, RAID 6, RAID 0 | RAID 0, 6 | not specified | RAID 0, 5, 6 | not specified | not specified | not specified | not specified | not specified | not specified | not specified |
| Form Factor | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount |
| Hardware Interface | not specified | SATA | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified |
| Number of Bays | 4-Bay | 4-Bay | 12-Bay | 4-Bay | 4-Bay | 12-Bay | 12-Bay | 4-Bay | 8-Bay | not specified | not specified | 4-Bay | 8-Bay | 4-Bay | 4-Bay |
| Processor Cores | not specified | not specified | Quad-Core | not specified | not specified | not specified | not specified | not specified | 8-Core | not specified | 8-Core | not specified | not specified | not specified | not specified |
| Dimensions | 21.3 × 16.5 × 7.87 inches | 21.3 × 16.3 × 7.05 inches | 21.1 × 17.3 × 3.46 inches | 21 × 15.8 × 5.45 inches | 7.9 × 23 × 21.3 inches | 29 × 3.4 × 18.9 inches | 29 × 3.5 × 18.9 inches | not specified | 23 × 21 × 8 inches | 1 × 13 × 24 inches | 22.7 × 17.3 × 4.57 inches | not specified | not specified | not specified | not specified |
| Weight | 4.41 pounds | not specified | 25.8 pounds | not specified | 27.2 pounds | 55.4 pounds | 54.2 pounds | not specified | 9 pounds | not specified | 33.7 pounds | not specified | not specified | not specified | not specified |
| Size | 4 Bay | 4 Bay | 5.5"(W) x 7.5"(H) x 9.1"(D) | RS422+ | 32TB (4x8TB) | 240TB (12x20TB) | 80TB (4x20TB) | 8TB (4x2TB) | Short Rackmount-RP (Unav.) | not specified | not specified | 4 Bay | Single Power | not specified | 4 Bay |
| Color | Black | black | AS6512RD | Black | Black | Black | Black | Black | Black or Gray | Multicolor | Black | Black | Black | not specified | not specified |
| Model | TR-004U | TL-R400S | AS6512RD | RS422+ | TS5420RN3204 | TS51220RH24012 | TS71210RH8004 | TS3420R0804S | TS-855EU-RP-8G-US | TL-R1600PES-RP-US | AS7216RDX | TS-432PXU-RP-2G-AM-US | TS-873AeU-4G-AM-US | not specified | not specified |
If you need matching bandwidth for your enclosure, you can compare the best rackmount network switches by their uplink specifications.
How to choose the right rackmount NAS
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Check physical rack depth
Rack depth varies significantly among these units. You must measure your available space before buying. The QNAP TL-R1600PES is a 16-bay expander with a unique 1-inch depth, while the BUFFALO TS51220RH requires 29 inches of depth. Ensure your rack has enough clearance for the longest model you consider. The QNAP TR-004U measures 21.3 inches, fitting most standard racks. Always verify width and height to ensure the unit fits your 19-inch rack slots without obstruction.
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Select appropriate drive bays
Bay count determines your raw storage potential. If you need to expand existing QNAP NAS storage, the QNAP TR-004U offers four SATA drive bays. For larger capacity virtualization, the Asustor Lockerstor provides twelve bays. The QNAP 8-Bay Short-Depth model offers eight bays for compact setups. Fewer bays mean less raw capacity but often a smaller footprint. You should choose the lowest bay count that meets your future growth needs to save space and power.
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Verify network interface speeds
Network connectivity affects data transfer rates. The BUFFALO TeraStation 5420RN includes 10GbE ports for high-speed team access. The QNAP 4-Bay Rackmount NAS also delivers 10GbE networking for compact deployments. Many models, like the Asustor Lockerstor, offer dual 2.5GbE ports for balanced performance. You should check if the unit supports 1GbE, 2.5GbE, or 10GbE to match your current switch infrastructure. Faster ports reduce bottlenecks when multiple users access files simultaneously.
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Assess RAM capacity needs
RAM impacts multitasking and virtualization performance. The Asustor Lockerstor supports up to 128GB RAM for demanding network deployments. The Asustor 16-Bay Rackmount NAS includes 16GB RAM for high-capacity storage tasks. The QNAP 8-Bay Short-Depth model allows memory expansion up to 64GB ECC. You should prioritize higher RAM if you run virtual machines or heavy applications. Units with limited or non-expandable RAM are better suited for simple file storage and backup tasks.
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Determine processor requirements
Processor cores handle encryption and virtualization loads. The Asustor 16-Bay Rackmount NAS features an 8-Core AMD Ryzen processor. The QNAP 8-Bay Short-Depth model provides an 8-Core Intel Atom CPU for capable hardware headroom. The Asustor Lockerstor uses a quad-core processor for business storage. You should match core count to your workload. Simple file sharing requires fewer cores, while running Docker containers or virtual machines demands higher processing power for smooth operation.
Frequently asked questions
What is the difference between a rackmount NAS and a JBOD?
A rackmount NAS includes its own processor, RAM, and operating system to manage data independently. A JBOD unit, like the QNAP TL-R1600PES, acts as a drive expander for an existing host NAS. JBODs provide raw storage bays without independent network management features, making them suitable for adding capacity to an existing setup.
Which rackmount NAS offers the highest RAM capacity?
The Asustor Lockerstor 16 Pro supports up to 16GB of RAM. This high memory capacity aids in handling demanding virtualization workloads and large file transfers. Other models like the QNAP TR-004U and Synology RS422+ do not list expandable RAM in their specifications, focusing instead on storage density and network connectivity.
Do any rackmount NAS drives come with pre-installed hard drives?
Yes, several BUFFALO TeraStation models include pre-installed drives for immediate use. The TS5420RN comes with 32TB across four 8TB drives, while the TS51220RH includes 240TB across twelve 20TB drives. In contrast, most QNAP and Asustor models in this list are sold as bare chassis requiring you to purchase drives separately.
How deep are the shallowest rackmount NAS units?
The QNAP TL-R1600PES has a unique 1-inch depth, designed specifically for tight spaces. The QNAP TR-004U measures 21.3 inches in length. The Asustor AS6512RD is 21.1 inches long. You must check these dimensions carefully to ensure the unit fits within your available rack depth, as some models like the BUFFALO TS51220RH require 29 inches.
Which rackmount NAS supports 10GbE networking?
The Asustor Lockerstor 16 Pro features 10GbE ports alongside 1GbE connectivity. BUFFALO models like the TS5420RN and TS51220RH also provide 10GbE speeds for high-throughput transfers. Other units, such as the QNAP TS-464eU, focus on 2.5GbE or 5GbE connections, which are sufficient for many small office environments but offer lower maximum bandwidth.
What is the weight of the heaviest rackmount NAS?
The BUFFALO TS51220RH is the heaviest unit at 55.4 pounds. This weight results from its 12-bay capacity and pre-installed 240TB of drives. The TS5420RN follows at 27.2 pounds. Ensure your rack infrastructure can support these weights, as lighter models like the QNAP TL-R1600PES weigh significantly less due to their JBOD design.
Can I expand the RAM in a rackmount NAS?
Yes, several models support RAM upgrades. The Asustor AS6512RD expands up to 128GB, and the Asustor AS7216RDX supports 16GB. The QNAP TS-855EU-RP allows expansion up to 64GB ECC. You should verify the specific RAM capacity and upgrade limits for your chosen model to ensure it meets your performance requirements for virtualization or heavy multitasking.