UGREEN NASync DH4300 Plus NAS Review UK (2026) – Tested

Spec sheets tell you the DH4300 Plus has an 8-core processor and 2.5GbE networking. What they don’t tell you is whether the UGOS software actually works as advertised, if those AI photo features are genuinely useful, or how this £370 NAS compares to established players like Synology and QNAP. After two weeks of transferring files, testing RAID configurations, and stress-testing the photo management system, I’ve got answers.

But here’s the thing: NAS performance isn’t just about raw hardware. It’s about how the software leverages that hardware. And that’s where this gets complicated.

The duplicate detection worked better. It successfully identified and flagged about 200 duplicate images from various backup sources. However, the “baby growth album” feature felt gimmicky, it’s essentially just chronological sorting with a different UI skin.

What genuinely impressed me was the scene detection. The system accurately categorised photos into beaches, mountains, food, pets, and other categories with about 85% accuracy. This is genuinely useful when you’re trying to find “that photo from the beach holiday” without remembering when you took it.

I ran the DH4300 Plus through my standard NAS testing protocol, which involves real-world scenarios rather than synthetic benchmarks. Here’s what actually matters:

File transfers over the 2.5GbE connection consistently hit 280-290MB/s when writing large files. That’s genuinely fast, about 2.5 times quicker than the gigabit NAS I’m replacing. Copying my 200GB Lightroom catalogue took about 12 minutes instead of the 30+ minutes on my old Synology DS418.

But (and this is important) those speeds only materialise if your entire network supports 2.5GbE. I had to upgrade my switch and add a PCIe network card to my desktop. If you’re running standard gigabit networking, you’ll be bottlenecked at around 110-115MB/s regardless of what the NAS can do.

The processor handled multiple simultaneous tasks well. I deliberately stress-tested it by streaming three 4K videos to different devices whilst running a full photo library scan and copying files from my desktop. The system remained responsive throughout, though the web interface did occasionally lag by a second or two when loading thumbnails.

Drive installation is tool-free using plastic caddies that slide into the bays. They’re not as robust as the metal caddies on my Synology, but they work fine. Each caddy locks with a small lever mechanism that provides a reassuring click. I installed and removed drives multiple times during testing without any issues.

Noise levels are noticeable. The single 80mm fan isn’t loud by NAS standards, but it’s audible in a quiet room, I measured about 32dB at one metre during normal operation, rising to 36dB under heavy load. If you’re planning to keep this in a bedroom or quiet office, you’ll hear it. Drive noise depends on what you install, but my WD Red Plus drives added minimal additional noise.

Thermal performance was adequate. After 48 hours of continuous operation with heavy file transfers, drive temperatures stabilised at 38-42°C (measured via SMART data), which is perfectly acceptable. The processor stayed around 55-60°C under sustained load.

The wizard guides you through creating a storage pool, selecting a RAID level, and setting up user accounts. It’s less intimidating than Synology’s DSM, which might actually be a positive for first-time NAS users. However, that simplicity comes at a cost, advanced users will quickly hit the limits of what UGOS allows you to configure.

The web interface is clean and reasonably intuitive. File management works as you’d expect, with drag-and-drop uploads and a folder structure that makes sense. Photo browsing through the web interface is acceptable, though thumbnail generation can be slow when you first access a folder with hundreds of images.

Where UGOS falls short is in the details. There’s no proper task scheduler for automated backups. Docker support is completely absent, which rules out running additional services like Plex, Home Assistant, or custom applications. The backup options are limited to basic folder sync, nothing like Synology’s Hyper Backup with versioning and cloud integration.

The mobile app (UGREEN Cloud) handles basic photo backup and file access but feels like a first-generation product. It’s slower than Synology Photos when browsing large libraries remotely, and the interface occasionally stutters when scrolling through thumbnails. It works, but it’s not pleasant to use.

However, the UGREEN offers better hardware for the money. That 8-core processor outperforms the DS423+’s Celeron J4125 in multi-threaded tasks, and the dual 2.5GbE ports (versus gigabit on the Synology) deliver noticeably faster transfers if your network supports it.

QNAP’s TS-464 sits between them at around £449. It offers 2.5GbE networking like the UGREEN, more RAM (8GB expandable to 16GB), and QTS software that’s more capable than UGOS but more complex than DSM. If you want Docker support and don’t mind a steeper learning curve, the QNAP represents a middle ground.

The question becomes: do you prioritise hardware performance and value, or software maturity and ecosystem? The UGREEN wins on hardware specs per pound but loses decisively on software quality and features.

Here’s the value proposition in practical terms: if you’re primarily using this for photo storage, media streaming, and basic file sharing, the DH4300 Plus delivers solid performance at a competitive price. The hardware is genuinely capable, and UGOS handles these core functions adequately.

But if you want to expand beyond those basics, running Plex, setting up automated cloud backups, deploying Docker containers, or using advanced backup features, you’ll quickly hit UGOS’s limitations. At that point, spending an extra £130 for a Synology DS423+ becomes a better investment because the software capabilities justify the premium.

The “no monthly fees” marketing is somewhat disingenuous. Yes, you avoid cloud storage subscriptions, but that’s true of any NAS. What UGREEN doesn’t mention is that you’ll need to buy hard drives separately (expect £150-200 for quality 8TB drives), and you might need to upgrade your network infrastructure to benefit from the 2.5GbE speeds.

But right now, in early 2026, you’re buying potential rather than a complete product. The core functionality works well enough for basic use cases, but the software gaps become frustrating if you want to do anything beyond simple file storage and photo backup.

Who should buy this? First-time NAS users who prioritise hardware performance and value over software polish. Families wanting to escape cloud storage subscriptions without needing advanced features. Anyone willing to tolerate software limitations in exchange for fast transfer speeds and capable hardware.

Who should skip it? Power users who need Docker, comprehensive backup solutions, or extensive third-party app support. Anyone coming from Synology or QNAP who’s accustomed to mature software ecosystems. Users who want a “set it and forget it” experience without waiting for software updates to add missing features.