Unmatched stability and simplicity, but less powerful hardware.
Superior raw performance and expandability, but complex OS.
Good hardware and new OS, but software reliability needs confirmation.
👍 What we like
- ✓Efficient Intel QuickSync hardware transcoding for Plex/Jellyfin 4K.
- ✓Native Docker and Virtual Machine Manager support for homelab projects.
- ✓RAID 5/6 architecture for data security and fault tolerance.
👎 What to watch
- ✕Synology: High price for moderate hardware specs.
- ✕QNAP: QTS interface feels dated and has a steeper learning curve.
- ✕UGREEN: App ecosystem and updates are still under development.
🏆 Our picks
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📑 Contents ▾
Choosing a 4-bay NAS in 2026 is not just about storage capacity; it is a complex trade-off between software simplicity, raw processing power, and extension flexibility. For serious use cases involving virtualization, 4K streaming, and critical backups, entry-level models are no longer sufficient. You need an architecture capable of handling I/O loads without becoming a bottleneck. This guide analyzes three major players currently dominating the segment: the Synology DS423+, the QNAP TS-464, and the challenger UGREEN DXP4800. The goal is to determine which one integrates best into your homelab ecosystem, whether you are a Home Assistant user seeking a robust backend or a virtualization enthusiast running Proxmox.
Why this choice matters
Investing in a 4-bay NAS is based on precise technical criteria that directly impact the hardware’s longevity and utility. First, the CPU is the heart of the system. Unlike 2-bay units, 4-bay models often need to manage software RAID (ZFS or SHR) and virtualization services simultaneously. A CPU with good IPC (Instructions Per Cycle) and a sufficient number of cores is crucial to prevent system saturation during media indexing or snapshot creation.
Second, RAM management is a major friction point. While consumer NAS units often limit RAM to 4 GB soldered to the board, serious use in virtualization or with TrueNAS Scale requires at least 8 to 16 GB, ideally expandable. ECC (Error Correcting Code) RAM compatibility is a luxury reserved for some high-end models, but expandability via SO-DIMM DDR4/DDR5 slots has become an expected standard for “Pro” models.
Third, hardware acceleration for video transcoding (Intel QuickSync) remains indispensable for Plex or Jellyfin servers. Without it, a modern CPU must run at 100% to transcode a 4K HDR video, preventing any other tasks from running. Finally, 2.5GbE network connectivity is now the minimum standard to take advantage of SATA III and NVMe speeds, avoiding bottlenecks during large file transfers or VM backups.
Buying criteria
When selecting a NAS, prioritize the software ecosystem. Synology offers DSM, known for its stability and ease of use, while QNAP provides QTS, which is more technical but extremely feature-rich. UGREEN, with its new Linux Debian-based interface, attempts to bridge both worlds. You should also check bay compatibility: some units require specific caddies or precise mounting screws. The presence of M.2 ports for NVMe cache or direct storage can significantly accelerate Docker application and database performance. Finally, the ability to install a third-party OS like TrueNAS Core or Proxmox VE via workarounds (if you are comfortable with debugging) can be a decisive argument for open-source purists.
Recommended products overview
Synology DS423+
The Synology DS423+ embodies the “install and forget” philosophy. Equipped with a quad-core Realtek RTD1619B processor, it may seem weak on paper compared to its Intel competitors, but DSM (DiskStation Manager) optimization more than compensates for this lack of raw power. It features two NVMe M.2 slots for cache or storage, which is rare at this price point. The RAM is soldered at 2 GB, which is a major weakness for heavy virtualization, but sufficient for Docker and basic services. Intel QuickSync transcoding is present and very efficient for 1080p and 4K H.265. Its SHR file system is flexible, allowing you to mix drives of different sizes. It is the choice for stability and simplicity, ideal for those who want to focus on their data rather than server maintenance.
QNAP TS-464
The QNAP TS-464 is a performance-oriented powerhouse. It features an Intel N5095 (or N5105 depending on revisions) quad-core processor, offering significantly more computing power than Synology’s Realtek chip. It has four NVMe M.2 slots (two internal, two via M.2-to-SATA adapter if necessary) and two SO-DIMM DDR4 slots expandable up to 16 GB, or even 32 GB. This RAM expandability makes it ideal for running multiple virtual machines under Virtualization Station or hosting TrueNAS Scale. The QTS interface is more complex with a steeper learning curve, but it offers granular control over every aspect of the system. Hardware transcoding is excellent, supporting AV1 decoding. It is the choice for power users who want to maximize hardware performance.
UGREEN NASync DXP4800
UGREEN entered the market with the DXP4800, offering an attractive alternative with an Intel N100 (or N95 depending on region) quad-core processor. This CPU is very energy-efficient and offers impressive single-thread performance for its power consumption. The standout feature of this model is its Linux Debian-based operating system, called NASync OS, which promises greater transparency and better compatibility with native Docker containers. It features two NVMe M.2 bays and expandable RAM slots. Although the brand is newer to the NAS sector, its build quality and hardware specs are solid. Integration with Home Assistant and modern virtualization tools is facilitated by the more “open” nature of its OS. It is the choice for those seeking a good price-to-performance ratio with a more technical and modern approach.
Comparison table
| Criterion | Synology DS423+ | QNAP TS-464 | UGREEN DXP4800 |
|---|---|---|---|
| CPU | Realtek RTD1619B (Quad) | Intel N5095/N5105 (Quad) | Intel N100/N95 (Quad) |
| RAM | 2 GB (Soldered) | 4 GB (Expandable 16GB+) | 8 GB (Expandable) |
| NVMe Bays | 2x M.2 (Cache/Storage) | 4x M.2 (2 internal + 2 adapter) | 2x M.2 (Cache/Storage) |
| Network | 2x 2.5GbE | 2x 2.5GbE | 2x 2.5GbE |
| Transcoding | Intel QuickSync (H.265/HEVC) | Intel QuickSync (H.265/AV1) | Intel QuickSync (H.265/AV1) |
| OS | DSM (Proprietary, Stable) | QTS (Complex, Powerful) | NASync OS (Linux-based) |
| Indicative Price | ~€350-400 (Chassis only) | ~€400-450 (Chassis only) | ~€300-350 (Chassis only) |
Note: Prices are indicative and vary by promotions and regions. You can find these models on Amazon, often bundled with hard drives.
Use cases
For pure media libraries, the Synology DS423+ is often the best choice thanks to its Video Station app or well-integrated Plex setup. The simplicity of configuring SMB and NFS shares facilitates access from TVs and Android boxes. If you have a massive 4K collection and little time for maintenance, go with Synology.
For homelab and virtualization, the QNAP TS-464 dominates. The ability to add RAM and use the four NVMe ports for a high-performance ZFS pool makes it an ideal workstation. You can run Proxmox, Home Assistant OS, and a backup server on it without breaking a sweat. The power of the N5105 allows it to transcode multiple 4K streams simultaneously without impacting VMs.
The balanced / tight budget profile leans toward the UGREEN DXP4800. If you are comfortable with Linux and want a powerful machine (N100) at a lower price, it is an excellent option. Its Debian-based OS facilitates the installation of complex Docker services without the restrictions sometimes seen with Synology. It is also a good choice for those who want to experiment with newer technologies without investing in a high-end QNAP solution.
Pitfalls to avoid
A common pitfall is underestimating the amount of RAM needed for virtualization. Buying a NAS with 4 GB of RAM to run multiple VMs is a mistake. Always plan for RAM expansion from the start if you intend to virtualize. Another pitfall is ignoring hard drive compatibility. Some NAS units have Hard Drive Compatibility Lists (HCL) that guarantee better stability, especially in ZFS RAID. Always check compatibility before buying your drives. Finally, do not neglect the 3-2-1 backup rule. A NAS is not a backup. Invest in cloud storage or an external USB drive for your critical data.
Verdict
The final choice depends on your administration philosophy. If you want a tool that just works and you don’t want to spend your time troubleshooting, the Synology DS423+ remains the reference, despite its RAM limitations. For those who want raw power and maximum flexibility, the QNAP TS-464 is unbeatable, offering an excellent price-to-performance ratio for power users. Finally, the UGREEN DXP4800 represents a promising alternative for those seeking a more modern and open experience, with competitive hardware at an attractive price. Whatever your choice, ensure you properly configure your snapshots and external backups to protect your data. For more details on optimal configurations, consult our guides on /comparatifs/ and /materiel-recommande/.