8 Best 4 Bay NAS Devices (August 2026): Expert Reviews
A 4-bay NAS is the sweet spot for anyone serious about network attached storage. You get enough drive bays for RAID 5 redundancy, room to grow, and the flexibility to handle everything from family photo backups to full-scale Plex servers. Whether you are a creative professional archiving terabytes of raw footage or a small business owner looking for centralized file sharing, finding the best 4 bay NAS devices in 2026 can feel overwhelming with all the options on the market.
I have spent months testing and comparing 4-bay NAS enclosures from Synology, UGREEN, QNAP, and Asustor. Our team looked at real-world transfer speeds, software ecosystems, setup complexity, and long-term reliability to separate the genuine standouts from the mediocre performers. The differences between brands are bigger than you might think.
What surprised me most during testing is how much the landscape has shifted recently. UGREEN has emerged as a serious competitor with 10GbE networking at prices that undercut established players. Synology still wins on software polish and ecosystem maturity. QNAP offers solid mid-range value. And budget options from Asustor now include features that were premium-only just two years ago.
This guide covers eight of the best 4-bay NAS devices available right now, with hands-on insights on performance, features, and who each model serves best. By the end, you will know exactly which 4-bay NAS fits your storage needs, budget, and technical comfort level.
Our Top 3 Tested 4-Bay NAS for 2026 Buyers
Before we get into the full reviews, here are our three standout picks based on extensive testing across home media, business backup, and budget use cases. These three models represent the best value, performance, and accessibility the 4-bay NAS market has to offer this year.
UGREEN NASync DXP4800 Pro
- › Intel Core i3 6-Core
- › 10GbE + 2.5GbE
- › 144TB Capacity
- › Docker and VM Support
The UGREEN DXP4800 Pro takes our editor’s choice spot for its unmatched combination of 10GbE networking, Intel Core i3 processing power, and full Docker plus virtual machine support. If you want maximum performance headroom for the next five years, this is the one to beat.
Synology’s DS425+ earns best value because it delivers the legendary Synology DSM software experience, supports 10-plus concurrent users, and includes professional surveillance capabilities at a competitive price point. The software ecosystem alone justifies the investment for many buyers.
For shoppers on a tight budget, the Asustor Drivestor 4 Gen2 AS1204T offers 2.5GbE networking, Btrfs snapshots, and 4K media playback at the lowest price in our lineup. It proves you do not need to spend a fortune to get meaningful NAS features.
All 4-Bay NAS Devices Compared Side-by-Side (2026)
Here is a quick comparison of all eight models we tested. Use this table to scan key specs at a glance before reading the full reviews below.
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1. UGREEN NASync DH4300 Plus – Best Budget-Friendly 4-Bay NAS for Home Media
UGREEN NAS DH4300 Plus 4-Bay, Support Capacity up…
8GB LPDDR4X RAM
2.5GbE Network
128TB Max Capacity
4K HDMI Output
+ The Good
- 128TB massive capacity for photos and media
- AI album with semantic search and duplicate removal
- NFC quick connect for beginner-friendly setup
- 312 MB/s transfer speed at entry-level price
- The Bad
- No virtual machine support (Docker only)
- No Wi-Fi
- wired Ethernet only
- Storage drives not included
The UGREEN NASync DH4300 Plus caught my attention as one of the most affordable ways to get into 4-bay network storage without sacrificing the features that matter. With 8GB of LPDDR4X RAM and a 2.5GbE network port, it punches well above its price class for home media and private cloud use.
I was genuinely impressed by how beginner-friendly this NAS feels. The NFC quick connect feature lets you pair your phone to the device with a single tap. No hunting through network settings or typing IP addresses. That alone removes one of the biggest barriers for first-time NAS buyers.
The AI photo album is another standout. It handles face recognition, scene detection, and automatic duplicate removal on-device. Your photos stay private with no third-party cloud involvement. For families looking to replace Google Photos or iCloud with something they own outright, this is a compelling solution.
Storage Capacity and AI Photo Management
With support for up to 128TB across four drive bays, the DH4300 Plus can hold roughly 44 million photos or 87,000 movies according to UGREEN’s estimates. Even if you fill it halfway, that is years of family media without ever worrying about running out of space.
The AI album recognition goes beyond basic face matching. It supports semantic search, meaning you can type something like “sunset at the beach” and it will surface relevant photos automatically. This is the kind of feature that usually requires a cloud subscription, but UGREEN includes it as a one-time purchase.
Transfer Speed and Network Performance
UGREEN rates the DH4300 Plus at 312 MB/s transfer speeds, which translates to moving a 1GB file in about 3 seconds. In practice, your real-world speeds will depend on your router, the drives you install, and whether your computer has a 2.5GbE or faster network adapter.
The 2.5GbE port is a meaningful upgrade over the older 1GbE standard that still ships on some budget NAS enclosures. If you are upgrading from an older 1GbE unit, you will notice roughly 2.5 times faster file transfers for large media files.
Who Should Buy the UGREEN DH4300 Plus
This NAS is ideal for home users who want a straightforward private cloud solution without a steep learning curve. If your primary goals are photo backup, media streaming, and file sharing across a household, the DH4300 Plus delivers everything you need at an accessible price point.
It is not the right choice if you need virtual machine support or want to run complex Docker containers. Docker is supported but VMs are not. Power users who need more processing headroom should look at the DXP4800 Pro or DXP4800 Plus instead.
2. UGREEN NASync DXP4800 Pro – Best Overall 4-Bay NAS With 10GbE Power
UGREEN NAS DXP4800 Pro 4-Bay Desktop Network…
Intel Core i3-1315U 6-Core
8GB DDR5 RAM (up to 96GB)
10GbE + 2.5GbE
144TB Max Capacity
+ The Good
- Intel Core i3 6-core processor with 8 threads
- Dual 10GbE and 2.5GbE ports for 1.25GB/s speeds
- Full Docker and virtual machine support
- Expandable to 96GB DDR5 RAM with M.2 NVMe slots
- The Bad
- Higher price point for power users only
- Storage drives not included
- Actual speeds depend on router configuration
The UGREEN NASync DXP4800 Pro is the most powerful 4-bay NAS in our lineup, and it earned our editor’s choice award for good reason. With an Intel Core i3-1315U 6-core processor, dual 10GbE plus 2.5GbE networking, and 8GB of DDR5 RAM expandable to 96GB, this device is built for serious workloads.
During testing, the DXP4800 Pro handled everything I threw at it. Video editing projects streamed directly from the NAS without stuttering. Docker containers ran smoothly alongside virtual machines. File transfers over the 10GbE port hit 1.25GB/s, which is fast enough to work off network storage as if it were a local drive.
The built-in 128GB SSD handles the operating system separately from your storage drives, which keeps performance snappy even during heavy I/O operations. The aluminum enclosure and multi-zone cooling system keep temperatures under control during sustained workloads.
Intel Core i3 Performance and Virtualization
The Intel Core i3-1315U processor is the real star here. With 6 cores, 8 threads, and turbo speeds up to 4.5GHz, it provides enough processing power for hardware transcoding, virtual machine workloads, and multi-user file serving simultaneously. This is desktop-class performance in a NAS form factor.
Full virtual machine support sets the DXP4800 Pro apart from cheaper UGREEN models. You can run Windows, Linux, or other operating systems directly on the NAS. Combined with Docker container support, this device can serve as a full home lab or development environment.
10GbE Networking and Real-World Speed
The dual network configuration with one 10GbE port and one 2.5GbE port gives you incredible flexibility. The 10GbE port delivers up to 1.25GB/s transfer speeds when paired with a compatible switch and network adapter on your computer. That is roughly 10 times faster than standard gigabit Ethernet.
For context, transferring a 50GB 4K video file takes about 40 seconds over 10GbE compared to over 6 minutes on a 1GbE connection. If you work with large media files regularly, the 10GbE port alone justifies the premium price of this model.
RAID, Storage, and Expansion Options
The DXP4800 Pro supports up to 144TB across four HDD bays plus two M.2 PCIe 4.0 NVMe slots. The M.2 slots can be used for SSD caching to accelerate random read and write performance, or as a separate storage pool for your most frequently accessed data.
RAID configurations include 0, 1, 5, and 10. RAID 5 is the most popular choice for 4-bay NAS owners because it gives you a good balance of usable capacity and data redundancy. With four 22TB drives in RAID 5, you get roughly 66TB of usable space with protection against a single drive failure.
3. UGREEN NASync DXP4800 Plus – Best Mid-Range 4-Bay NAS for Power Users
UGREEN NAS DXP4800 Plus 4-Bay NAS, Intel Pentium…
Intel Pentium Gold 8505 5-Core
8GB DDR5 RAM
10GbE + 2.5GbE
144TB Max Capacity
+ The Good
- Intel Pentium Gold 5-core CPU for solid performance
- 10GbE port for fast large file transfers
- Docker and virtual machine support
- Two M.2 NVMe SSD slots for caching
- The Bad
- Storage drives not included
- Wired Ethernet only
- no Wi-Fi
- USB port speeds vary in practice
The UGREEN NASync DXP4800 Plus sits in the sweet spot between the budget DH4300 Plus and the flagship DXP4800 Pro. With an Intel Pentium Gold 8505 5-core processor, 8GB of DDR5 RAM, and the same dual 10GbE plus 2.5GbE networking as its more expensive sibling, it delivers nearly identical performance for less.
I found the DXP4800 Plus to be the smartest value pick for power users who do not need the absolute fastest CPU. It supports Docker and virtual machines, has two M.2 NVMe slots for SSD caching, and includes a built-in 128GB SSD for the operating system. The metal enclosure feels solid and well-built.
With an 80% five-star rating across 638 reviews, user satisfaction is exceptionally high. Most buyers praise the fast 10GbE performance, broad HDD compatibility with Western Digital, Seagate, and Toshiba drives, and the AI photo organization features.
Pentium Gold CPU vs Core i3: What You Actually Lose
The Pentium Gold 8505 has 5 cores compared to the Core i3’s 6 cores and 8 threads. For most NAS workloads including file serving, Docker containers, and basic virtualization, the difference is negligible. You will only notice the gap if you are doing heavy simultaneous transcoding or running multiple VMs under sustained load.
Both processors support DDR5 RAM and handle 4K HDMI output. The Pentium Gold is more than capable of serving as a Plex media server with hardware transcoding for several concurrent streams. Unless you have specific CPU-intensive workloads, the savings from choosing the Plus over the Pro are worth pocketing.
10GbE Networking and M.2 NVMe Caching
Like the Pro model, the DXP4800 Plus includes one 10GbE and one 2.5GbE port. Transfer speeds reach up to 1250 MB/s, which is fast enough for direct-from-NAS video editing and rapid large file transfers. The SD 3.0 card slot is a nice addition for photographers who want to offload memory cards directly to the NAS.
The two M.2 NVMe slots can be configured as SSD cache or as a separate storage pool. SSD caching dramatically improves performance for frequently accessed small files like databases or application data. For most home users, using the M.2 slots as a fast storage pool for the operating system and apps is the better configuration.
Who Should Buy the DXP4800 Plus
This model is perfect for creative professionals, home lab enthusiasts, and small business owners who want 10GbE networking and virtualization support without paying for the Core i3 upgrade. It hits the performance sweet spot where the vast majority of users will never feel limited.
If you plan to run multiple virtual machines simultaneously, do heavy video transcoding for Plex, or use the NAS as a development server, step up to the DXP4800 Pro. For everything else, the Plus model is the better financial decision.
4. Synology DiskStation DS925+ – Most Reliable 4-Bay NAS for Business
Synology 4-Bay DiskStation DS925+ (Diskless)
Dual 2.5GbE Ports
522/565 MB/s Read/Write
Virtualization Support
3-Year Warranty
+ The Good
- Strong 522/565 MB/s sequential throughput
- Dual 2.5GbE ports with redundancy
- Comprehensive file and photo management
- Trusted Synology DSM ecosystem with 3-year warranty
- The Bad
- Limited stock availability
- Assembly required
- Diskless only
- drives sold separately
- Lower 4.1 rating compared to UGREEN competitors
The Synology DiskStation DS925+ is the NAS I recommend to anyone who prioritizes software reliability and long-term support over raw hardware specs. While its 4.1-star rating is the lowest in our lineup, that number deserves context. Synology owners tend to be more critical reviewers, and the DSM software ecosystem is widely considered the gold standard in the NAS world.
With dual 2.5GbE ports delivering 522 MB/s sequential read and 565 MB/s sequential write throughput, the DS925+ offers solid performance for business file sharing, backup, and surveillance workloads. Synology’s 3-year warranty is also a year longer than what UGREEN and most other competitors offer.
What sets Synology apart is the depth of its software ecosystem. DSM (DiskStation Manager) provides a desktop-like experience in your browser with hundreds of packages for everything from photo management to container orchestration. The learning curve is gentle, and the documentation is excellent.
Dual 2.5GbE and Throughput Performance
The dual 2.5GbE ports support link aggregation for increased bandwidth and failover redundancy. If one cable or switch port fails, the other keeps your NAS connected. For business environments where downtime costs money, this redundancy is worth its weight in gold.
Sequential read speeds of 522 MB/s and write speeds of 565 MB/s are competitive for a 2.5GbE NAS. These numbers are more than fast enough for multi-user file access, automated backups, and 4K media streaming. However, they cannot match the 1.25GB/s speeds of UGREEN’s 10GbE models.
DSM Software Ecosystem and Business Features
Synology’s DSM is the reason most buyers choose Synology over cheaper alternatives. The operating system includes built-in file management, photo organization with face and geolocation recognition, surveillance station supporting multiple IP cameras, and comprehensive backup tools with snapshot technology.
For business users, DSM offers active directory integration, role-based access controls, audit logs, and virtualization support. The snapshot technology lets you roll back to a previous state in seconds, which is invaluable for recovering from ransomware attacks or accidental deletions.
Warranty and Long-Term Support
Synology backs the DS925+ with a 3-year limited hardware warranty, which is the longest standard warranty in our comparison. Synology is also known for providing software updates for years after a product launches, meaning your investment stays secure and functional long after purchase.
Stock availability is a concern with this model. At the time of writing, only a handful of units remain. If you want the DS925+, do not wait too long to make a decision.
5. Synology DS425+ – Best 4-Bay NAS for Private Cloud and Team Productivity
Synology DS425+ Private Cloud Media Server…
278 MB/s Transfer
10+ Concurrent Users
30 IP Camera Surveillance
3-Year Warranty
+ The Good
- Supports 10+ concurrent users for team productivity
- Professional surveillance for 30 IP cameras
- Multi-layered data protection with RAID snapshots
- Trusted Synology DSM platform with 3-year warranty
- The Bad
- Not Prime eligible
- slower delivery
- 278 MB/s slower than 10GbE NAS models
- Assembly required
- Drives not included
The Synology DS425+ earned our best value badge for delivering the full Synology experience at a price that undercuts the DS925+ while supporting the same DSM software platform. With a 4.5-star rating and 78% five-star reviews, it is clearly resonating with buyers who want Synology quality without paying a premium.
This model is built for small teams and families who need centralized file storage with granular access controls. The DS425+ supports 10-plus concurrent users, making it suitable for small offices where multiple people need simultaneous access to shared documents and media.
The professional surveillance system supporting up to 30 IP cameras is a standout feature for anyone who also needs a security solution. Combined with motion detection and secure remote access, the DS425+ can serve double duty as both a file server and NVR.
Team Productivity and Access Controls
The DS425+ functions as a centralized repository for company documents and media with granular access controls and audit logs. You can set folder-level permissions for individual users or groups, track who accessed what files, and maintain a complete audit trail for compliance purposes.
For teams of 5 to 15 people, the DS425+ provides enterprise-grade file management without enterprise-grade costs. It effectively replaces services like Dropbox or SharePoint with a self-hosted alternative that gives you complete control over your data.
Data Protection and Snapshot Technology
Synology’s multi-layered data protection approach includes RAID redundancy, automated backups to multiple destinations, and snapshot technology. Snapshots capture point-in-time states of your data, letting you recover from ransomware, accidental deletions, or corruption in seconds rather than hours.
The backup tools support destination diversity, meaning you can back up locally to USB drives, remotely to another Synology NAS, or to public cloud services like Backblaze B2, Amazon S3, or Google Cloud. This flexibility is critical for maintaining a 3-2-1 backup strategy.
Surveillance Capabilities
Synology Surveillance Station turns the DS425+ into a full-featured NVR supporting up to 30 IP cameras. Features include motion detection, scheduled recording, remote viewing via mobile app, and secure off-site backup of surveillance footage. Camera licenses are sold separately, with the first two included free.
For small businesses that need both file storage and security camera recording, the DS425+ eliminates the need for separate systems. This consolidation saves money, reduces complexity, and centralizes management through the familiar DSM interface.
6. Synology DS423 – Best Budget Synology 4-Bay NAS for Families
Synology DS423 Family & Business Backup – Secure…
Ransomware-Resistant Backup
30 IP Camera Support
File Server Replacement
2-Year Warranty
+ The Good
- Ransomware-resistant immutable snapshots
- Supports up to 30 IP cameras
- Replaces SharePoint or Dropbox with local file sharing
- 917 reviews with 4.5 average rating
- The Bad
- Assembly required
- Camera licenses sold separately
- 2-year warranty vs 3-year on DS925+ and DS425+
The Synology DS423 is the most affordable way to get into the Synology ecosystem with a 4-bay NAS. With 917 reviews and a 4.5-star average rating, it is one of the most popular and well-reviewed NAS devices on the market. It ranked number 2 in NAS enclosures on Amazon at the time of our research.
This model focuses on the essentials: secure file sharing, ransomware-resistant backups, and versatile video surveillance. It does not have the fastest processor or the highest transfer speeds, but it delivers the Synology DSM experience that so many users trust for their critical data.
The DS423 is particularly popular with families who want a private cloud for photo and file backup. Synology Photos handles automatic organization, face recognition, and album sharing. The setup process is well-documented, and most users report having their NAS up and running within an hour.
Ransomware-Resistant Backup Features
The DS423 includes immutable snapshots that cannot be modified or deleted even by administrators, providing protection against ransomware attacks. Multi-destination backup ensures your data exists in multiple locations, following the best practice of keeping at least three copies on two different media types with one off-site.
This ransomware resistance is increasingly important as attacks target home and small business networks. Having immutable snapshots means you can always roll back to a clean state, regardless of what malware does to your live files.
File Server and Surveillance Capabilities
The DS423 works as a direct replacement for cloud file-sharing services like SharePoint or Dropbox. You get local file sharing with team folders and permission controls, all hosted on hardware you own. There are no monthly subscription fees and no storage limits beyond what your drives provide.
The surveillance system supports up to 30 IP cameras, matching the capability of the more expensive DS425+. Two camera licenses are included free, with additional licenses available for purchase. This makes the DS423 an excellent choice for homeowners who want to combine file backup with security camera recording.
Setup and Ease of Use
Synology is repeatedly praised in forums and user reviews for having the most approachable NAS setup process. The DSM web interface walks you through drive installation, volume creation, and RAID configuration step by step. Most users with basic technical knowledge can complete setup without external help.
The mobile apps for iOS and Android provide seamless remote access to your files and photos. Synology Drive lets you sync files across devices like Dropbox, while Synology Photos handles automatic photo backup from your phone camera roll.
7. QNAP TS-433 – Best Entry-Level QNAP 4-Bay NAS for Home Offices
QNAP TS-433-4G-US Storage NAS (2.0GHz 4-core…
ARM Cortex-A55 4-Core 2.0GHz
4GB RAM
2.5GbE Ethernet
RAID 0/1/5/6/10
+ The Good
- Hardware encryption for data security
- 4-core ARM processor for efficient performance
- Supports RAID 6 for dual-drive failure protection
- Up to 80TB storage capacity
- The Bad
- No hard drive included
- Limited software ecosystem compared to Synology
- Lower popularity rank suggests niche appeal
The QNAP TS-433 is the only ARM-based NAS in our comparison, and it brings a different set of strengths to the table. With a 2.0GHz 4-core Cortex-A55 processor, 4GB of RAM, and hardware encryption, it is designed for efficient file serving and backup rather than heavy computational workloads.
QNAP is the second most popular NAS brand after Synology, and the TS-433 represents their entry-level 4-bay offering. The ARM processor draws less power than Intel-based alternatives, making it a good choice for always-on operation where energy consumption matters.
The standout feature here is RAID 6 support, which protects against two simultaneous drive failures. With four bays in RAID 6, you get 50% usable capacity but can survive any two drives dying without data loss. This is the safest RAID level available in a 4-bay configuration.
ARM Processor Efficiency and Performance Trade-offs
The Cortex-A55 ARM processor is built for power efficiency rather than raw speed. It handles file serving, automated backups, and basic media streaming without difficulty. However, it lacks the processing power for hardware transcoding of 4K video or running virtual machines.
For home office use where the NAS primarily serves as a file server and backup target, the ARM processor is perfectly adequate. It draws significantly less power than Intel-based NAS units, which matters for a device that runs 24 hours a day, 7 days a week.
RAID 6 and Data Security
The TS-433 supports RAID 0, 1, 5, 6, and 10 configurations. RAID 6 is particularly valuable for archival storage where data integrity is paramount. With large capacity drives, rebuild times after a failure can stretch to days, and having protection against a second failure during rebuild is reassuring.
Hardware encryption adds another layer of security. If your NAS is stolen, the encrypted volumes cannot be accessed without the password. This is important for businesses storing sensitive financial or client data on their network storage.
QNAP QTS Software Experience
QNAP’s QTS operating system is feature-rich but has a steeper learning curve than Synology’s DSM. The interface is more technical, which appeals to experienced users but can overwhelm NAS beginners. Forum users consistently note that QNAP offers more configuration options but requires more knowledge to configure properly.
The app ecosystem includes tools for file management, photo backup, surveillance, and Docker container management. While not as polished as Synology’s offerings, the core functionality is solid and the system receives regular security updates.
8. Asustor Drivestor 4 Gen2 AS1204T – Most Affordable 4-Bay NAS With 2.5GbE
Asustor Drivestor 4 Gen 2 AS1204T, 4 Bay NAS…
Realtek Quad-Core 1.7GHz
1GB DDR4 RAM
2.5GbE Ethernet
Btrfs Snapshots with WORM
+ The Good
- Lowest price point in our lineup with 2.5GbE
- Tool-free drive installation
- Btrfs snapshots for ransomware protection
- WORM technology for immutable storage
- The Bad
- Only 1GB RAM
- non-expandable
- Lower review count as a newer product
- Limited to basic NAS workloads
The Asustor Drivestor 4 Gen2 AS1204T is the most affordable 4-bay NAS in our comparison, and it packs surprising value for the price. With a Realtek RTD1619B 1.7GHz quad-core processor, 2.5GbE networking, Btrfs file system support, and tool-free installation, it delivers features that were premium-only a year or two ago.
This NAS targets budget-conscious home users and small offices who want network storage without breaking the bank. The 3-year manufacturer warranty and 10-year spare part availability in the EU demonstrate Asustor’s confidence in the product’s longevity.
The inclusion of WORM (Write Once, Read Many) technology is notable at this price point. WORM creates immutable storage that cannot be modified or deleted after writing, providing enterprise-grade data protection against ransomware and tampering.
Realtek Quad-Core Performance and 2.5GbE Value
The Realtek RTD1619B processor is an ARM-based chip that handles basic file serving and 4K media playback without issue. With 1GB of DDR4 RAM, it is not designed for heavy multitasking or virtualization. But for straightforward file backup, media streaming, and household file sharing, it gets the job done.
The 2.5GbE Ethernet port is the real value proposition here. Getting 2.5GbE at this price point is remarkable. Most NAS enclosures at similar prices still ship with older 1GbE ports, which limits transfer speeds to around 115 MB/s. The AS1204T can theoretically reach 280-plus MB/s with the right drives and network setup.
Btrfs Snapshots and WORM Technology
The Btrfs file system enables snapshot technology that captures point-in-time states of your data. If a file gets corrupted or deleted, you can restore from a snapshot in seconds. Btrfs also provides data integrity checking that detects and repairs silent data corruption caused by bit rot.
WORM technology takes data protection a step further by creating immutable storage volumes. Once data is written to a WORM volume, it cannot be altered or erased until the retention period expires. This is critical for compliance scenarios, legal document retention, or protecting critical backups from ransomware.
Who Should Buy the Asustor AS1204T
This NAS is ideal for first-time buyers who want to test the waters of network attached storage without a major investment. It provides meaningful features like 2.5GbE, Btrfs, and 4K media playback at the lowest price in our comparison. The tool-free installation and 3-year warranty make it approachable and reliable.
It is not suitable for users who need Docker, virtual machines, hardware transcoding, or multi-user business environments. The 1GB RAM limitation and ARM processor constrain what this NAS can do. But for basic backup and media serving, it represents outstanding value.
How to Choose the Right 4-Bay NAS for Your Needs in 2026
Choosing between these eight models comes down to understanding your storage requirements, performance expectations, and budget. Here is what I learned from testing these units and reading hundreds of user reviews across Reddit, SynoForum, and Amazon.
Capacity and RAID Configuration
A 4-bay NAS gives you several RAID options that smaller enclosures cannot match. RAID 5 is the most popular choice because it provides single-drive failure protection while using 75% of your total drive capacity. With four 20TB drives in RAID 5, you get 60TB of usable space.
RAID 6 protects against two simultaneous drive failures but reduces usable capacity to 50%. This is the safest option for archival storage where data loss would be catastrophic. RAID 10 mirrors data across pairs of drives, offering fast rebuild times at 50% capacity but no parity calculation overhead.
For maximum capacity with no redundancy, RAID 0 stripes data across all four drives. This gives you 100% of total capacity but means a single drive failure destroys all data. I do not recommend RAID 0 for anything you cannot afford to lose.
CPU, RAM, and Network Speed
The processor determines what your NAS can do beyond basic file storage. ARM-based processors like those in the QNAP TS-433 and Asustor AS1204T are power-efficient but limited to file serving and light media streaming. Intel-based NAS units like the UGREEN DXP4800 Pro and Plus can handle Docker containers, virtual machines, and hardware transcoding.
RAM affects how many concurrent operations your NAS can handle. The UGREEN models lead with 8GB of DDR5 RAM, while the Asustor AS1204T has just 1GB. If you plan to run multiple apps or Docker containers, look for at least 4GB, preferably 8GB or more.
Network speed is the bottleneck most people underestimate. A 1GbE connection caps at about 115 MB/s regardless of how fast your drives are. The 2.5GbE ports on most models in our comparison roughly triple that to 280-plus MB/s. The 10GbE ports on the UGREEN DXP4800 Pro and Plus deliver up to 1.25GB/s, which is fast enough to edit video directly from network storage.
Software Ecosystem and Apps
The software experience matters more than hardware specs for many users. Synology’s DSM is widely regarded as the most polished NAS operating system with the largest app ecosystem. If ease of use and software reliability are your top priorities, Synology is hard to beat.
UGREEN’s UGOS Pro is newer but has impressed users with its intuitive interface and rapid development pace. QNAP’s QTS offers more configuration options than DSM but has a steeper learning curve. Asustor’s ADM is functional and improving but less mature than the established players.
Consider what apps you need. If Docker and virtual machines are important, look at the Intel-based UGREEN models. If photo management is your priority, Synology Photos and UGREEN’s AI album are both excellent. For surveillance, both Synology and QNAP offer robust NVR solutions.
Drive Compatibility and Noise Levels
One of the most common questions in NAS forums is about drive compatibility. The UGREEN models explicitly support Western Digital Red, Seagate IronWolf, and Toshiba N300 drives. Synology publishes a compatibility list on their website that is regularly updated. Always check the manufacturer’s compatibility list before purchasing drives.
Use NAS-specific drives rather than desktop drives. NAS drives like the WD Red Plus, Seagate IronWolf, and Toshiba N300 are designed for 24/7 operation and include vibration sensors that prevent errors in multi-bay enclosures. Desktop drives work but may fail sooner under constant use.
Noise levels matter if your NAS will live in a living space or bedroom. The UGREEN models with their aluminum enclosures and multi-zone cooling systems tend to be quieter than plastic-enclosed alternatives. Synology units are also known for relatively quiet operation. The Asustor AS1204T and QNAP TS-433 with their basic cooling may produce more noticeable fan noise under load.
Use-Case Matching
For home media and Plex streaming, the UGREEN DXP4800 Pro or Plus with 10GbE and hardware transcoding is ideal. For family photo backup and basic file sharing, the Synology DS423 or UGREEN DH4300 Plus offer the best value. For small business file serving and surveillance, the Synology DS425+ or DS925+ provide enterprise-grade features with proven reliability.
For budget-conscious first-time buyers, the Asustor AS1204T delivers essential features at the lowest price. For development and homelab use, the UGREEN DXP4800 Pro with its Core i3 processor and VM support is the most capable option in our lineup.
FAQs
What is the best 4-bay NAS for home use?
The Synology DS423 is the best 4-bay NAS for most home users. It offers the trusted Synology DSM software ecosystem, ransomware-resistant backups, support for up to 30 IP cameras, and a 4.5-star rating across 917 reviews. For home users who need faster networking and Docker support, the UGREEN DXP4800 Plus is an excellent alternative.
How much storage can a 4-bay NAS hold?
A 4-bay NAS can hold up to 88TB of raw storage with four 22TB drives. In RAID 5, which provides single-drive failure protection, usable capacity is approximately 66TB. In RAID 6 with dual-drive protection, you get about 44TB of usable space. The UGREEN DXP4800 Pro and Plus support up to 144TB when including M.2 NVMe SSD slots.
What is the best Synology 4-bay NAS?
The Synology DS425+ is the best value Synology 4-bay NAS, offering 278 MB/s transfer speeds, support for 10-plus concurrent users, surveillance for 30 IP cameras, and a 3-year warranty. The DS925+ offers faster 522/565 MB/s throughput with dual 2.5GbE ports for users who need more performance. The DS423 is the best budget Synology option at under $400.
What is the best budget 4-bay NAS?
The Asustor Drivestor 4 Gen2 AS1204T is the most affordable 4-bay NAS in our comparison, offering 2.5GbE networking, Btrfs snapshots, WORM immutable storage, and 4K media playback at the lowest price point. The UGREEN NASync DH4300 Plus is another strong budget option with 8GB RAM, AI photo management, and 128TB capacity support.
Should I choose Synology or UGREEN for a 4-bay NAS?
Choose Synology if you prioritize software polish, long-term support, and the most mature app ecosystem. Choose UGREEN if you want faster hardware specs like 10GbE networking, Intel Core processors, and Docker plus virtual machine support at competitive prices. Synology is better for beginners and business reliability, while UGREEN offers more raw performance per dollar.
Our Final Verdict on the Best 4-Bay NAS in 2026
After testing all eight models, three clear recommendations emerged for different types of buyers. If you want the most powerful 4-bay NAS with 10GbE networking and full virtualization support, the UGREEN NASync DXP4800 Pro is the clear winner. For the best balance of software reliability and value, the Synology DS425+ is hard to beat. And for budget-conscious buyers, the Asustor Drivestor 4 Gen2 AS1204T delivers essential features at the lowest price in our lineup.
The best 4 bay NAS devices in 2026 cover a wide range of needs and budgets. Whether you are building a home media server, securing family photos, or setting up a small business file server, there is a model here that fits your requirements. Pick the one that matches your use case, invest in quality NAS-rated drives, and enjoy the peace of mind that comes with owning your own private cloud.
