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NAS hardware doesn’t reinvent itself every generation, but the current refresh cycle – roughly the last 12 months – has moved the category further than the last two or three combined. Synology’s “+” line has stepped up its networking defaults, UGREEN has gone from a newcomer to a genuinely competitive alternative to the two established leaders, and QNAP and TerraMaster have both pushed 2.5GbE and NVMe caching further down into more affordable models than before. If you last researched NAS hardware more than a year ago, enough has changed that it’s worth a fresh look before assuming last generation’s recommendation still holds.
This isn’t a bay-count buying guide – our 2-bay, 4-bay under $300, 8-bay, and 12-bay+ guides already cover capacity tiers in depth. This piece is organized around recency instead: which specific models are the newest generation in their class, and what actually changed from the unit they replaced.
Who Should Care About “Newest,” Specifically
If you’re buying a NAS for the first time, capacity and budget should drive the decision more than release date – an older but proven model is often still the right buy. This guide matters more if you’re already comparing two similar-generation options and want to know which one is genuinely newer hardware, or if you owned a previous-generation unit (a DS923+, an original UGREEN DXP4800) and are wondering whether the newest refresh is worth upgrading to. In most of these cases, the newest generation is worth the premium specifically because of what changed in networking and caching, covered below – not because of a flashier case design.
What Changed in This Generation, Specifically
The single biggest shift across this refresh cycle is 2.5GbE becoming the baseline rather than the upsell. Two years ago, most consumer NAS units shipped with 1GbE ports and treated 2.5GbE (or 10GbE) as a paid add-in card for higher tiers. The newest generation across Synology, UGREEN, and QNAP increasingly ships 2.5GbE standard even on mid-range 4-bay units, which matters in practice – 1GbE tops out around 110MB/s in real-world transfers, while 2.5GbE comfortably clears 280MB/s, a difference you’ll actually notice moving large media files or running backups. The second real shift is UGREEN’s arrival as a legitimate third option alongside Synology and QNAP, with hardware that now genuinely competes on specs per dollar rather than trailing as a budget alternative.
Comparison: Newest Generation vs. What It Replaced
| Model (current gen) | Replaces | What Actually Changed | Approx. Price |
|---|---|---|---|
| Synology DS925+ | DS923+ | Standard 2.5GbE (was 1GbE + paid add-in card) | $600-700 |
| UGREEN NASync DXP4800 Plus | DXP4800 | More CPU headroom, refined DSM-style software (UGOS Pro) | $600-750 |
| QNAP TS-435XeU | TS-432X | Faster CPU class, improved multi-container performance | $500-600 |
| TerraMaster F4-424 Pro | F4-423 | Bumped RAM ceiling, faster NVMe caching support | $400-500 |
| Synology DS725+ | DS723+ | 2-bay stepped up to 2.5GbE standard as well | $400-450 |
The Picks
Synology DS925+ is the safest default if you already know and trust DSM. The generational jump to standard 2.5GbE is the single most useful change Synology made here, since the previous generation forced a paid add-in card for the same throughput – now it’s included from the start.
UGREEN NASync DXP4800 Plus is the one to watch in this list. Reviewers increasingly describe it as delivering more processing power and connectivity per dollar than comparable Synology or QNAP units at the same price point, and UGREEN’s own software has matured enough over this generation to be a real alternative rather than just a hardware-value play.
QNAP TS-435XeU targets households running heavier container or light virtualization workloads directly on the NAS – the CPU step-up over its predecessor is meaningful specifically for that kind of concurrent workload, less so for simple file storage where the older generation was already adequate.
- Marvell OCTEON TX2 CN9130 / CN9131 ARMv8 Cortex-A72 Quad Core 2.2 GHz processor and 4GB DDR4 RAM (up to 32GB
- Dual 2.5GbE (2.5G/1G/100M) ports accelerates file sharing across teams and devices or streamline large file transfers
- Future-proof your NAS server with Dual 10GbE networking
TerraMaster F4-424 Pro remains the value pick in this refresh cycle – genuinely useful generational improvements (RAM ceiling, NVMe caching) without TerraMaster’s pricing catching up to Synology or QNAP for equivalent hardware.
- Peak Performance 4-Bay NAS: Unleash the power of the F4-424 Pro NAS storage, featuring a Core i3-N305 8-core 8-thread CPU at 3….
- Enhanced Application Speed: The F4-424 Pro NAS enclosure, equipped with a robust CPU and DDR5 memory, achieves a remarkable 150…
- High-Speed Connectivity: The F4-424 Pro NAS case features dual 2.5 GbE interfaces and can achieve a linear data transmission sp…
Synology DS725+ brings the same 2.5GbE-as-standard shift down to the 2-bay tier, which matters for smaller households or a first NAS purchase where a 4-bay unit’s extra capacity and cost aren’t justified yet.
- Start Small, Scale Massive – Begin with 2 drives, expand to 140TB total capacity using DX525 expansion as your media library grows
- Multi-Layered Data Protection – Combine RAID redundancy, automated backups and snapshot technology to prevent data loss from an…
- Multi-site Surveillance – Manage security cameras across home or small business with advanced analytics and unlimited retention…
Noise Levels Have Improved Alongside Everything Else
It’s easy to focus entirely on networking and CPU specs and overlook one of the more genuinely noticeable improvements in this generation: acoustic design. Spinning hard drives are still the dominant noise source in any NAS running mechanical storage, but fan design and vibration dampening across this generation’s chassis have improved enough that several models in this comparison now publish noise ratings a few decibels quieter than their direct predecessors – a real difference if the unit lives somewhere other than a closet or basement. If placement near a living space is a factor, check the specific published dB rating rather than assuming “newer generation” automatically means quieter, since the improvement isn’t uniform across every model in this comparison.
Is Upgrading From a Previous Generation Actually Worth It?
Be honest with yourself about this before spending money. If your current NAS is running fine, has enough free bays or drive capacity for the next couple of years, and you’re not bottlenecked on network throughput during transfers or backups, a same-generation-newer unit is not an urgent purchase – NAS hardware isn’t like a phone where last year’s model feels dated. The upgrade genuinely earns its cost when you’re specifically hitting the 1GbE ceiling during large transfers, when your current unit’s CPU struggles with concurrent tasks (a backup job plus Plex transcoding, for instance), or when you’re buying new anyway and the price difference between last generation and this one is small enough that there’s no reason to buy behind the curve.
Drive Compatibility Lists Are Worth Checking Before You Buy Drives Separately
Every NAS in this comparison ships diskless, meaning the drives themselves are a separate purchase, and it’s worth checking each manufacturer’s current compatibility list before buying drives independently. Synology in particular has tightened drive compatibility enforcement on newer DSM versions, with some models showing warnings or reduced functionality when running drives outside its officially validated list, even when those drives work perfectly fine technically. UGREEN and TerraMaster have historically been more permissive about third-party drives, which is worth factoring in if you already own drives you’re hoping to reuse from a previous build rather than buying the manufacturer’s own validated (and often pricier) drive options.
Software Maturity Still Separates the Brands More Than Hardware
Raw hardware specs across this generation have converged more than they used to – a UGREEN, Synology, and QNAP unit at the same price point now offer genuinely comparable CPU and networking hardware. What still separates them meaningfully is software polish: Synology’s DSM remains the most refined and stable ecosystem, with the widest range of first-party apps (Photos, Drive, Active Backup) and the most predictable update cadence. UGREEN’s UGOS Pro has closed the gap considerably over this generation but still trails DSM in third-party app ecosystem breadth. QNAP’s QTS sits in between – more power-user configurability than Synology, at the cost of a steeper learning curve. If software experience matters as much as hardware to you, weigh that over the spec sheet differences in the comparison table above.
Migration Considerations When Moving to a Newer Generation
Moving data from a previous-generation unit to its replacement is usually more straightforward than moving between brands, since most vendors design their migration tools specifically around generational upgrades within their own ecosystem – Synology’s Hyper Backup and DSM migration assistant, for example, are built to expect exactly this scenario. Still, back up anything irreplaceable before starting, and don’t assume drives from an old unit will simply pop into a new chassis and work identically; RAID/volume format compatibility varies by exact model pairing, and it’s worth confirming your specific old-to-new migration path is supported before physically moving drives rather than migrating over the network.
NVMe Caching Has Quietly Become a Standard Feature
A generation ago, adding NVMe SSD caching to a spinning-drive NAS meant hunting for a specific model with dedicated M.2 slots, often as a premium feature reserved for higher-tier units. That’s shifted meaningfully in this refresh cycle – M.2 NVMe slots for read/write caching now show up standard on most mid-range 4-bay units across Synology, UGREEN, QNAP, and TerraMaster, not just the flagship tiers. The practical benefit is real for specific workloads: a small NVMe cache meaningfully speeds up random small-file access (a Plex library’s metadata, active project files, or a busy Nextcloud instance) without paying for an all-flash array. It’s less useful for simple large-file storage and backup, where sequential throughput off the spinning drives themselves is already the bottleneck, not random access latency.
Buying New vs. Refurbished or Open-Box
Every model in this comparison is also findable at a discount through manufacturer refurbished programs or open-box listings, and it’s worth considering deliberately rather than defaulting to new. A NAS chassis and its networking hardware are mechanically simple compared to something like a laptop battery or a phone screen, and a refurbished unit from a reputable seller with a real warranty is often a genuinely reasonable way to get into this generation’s networking improvements at a meaningfully lower price. The caution is drive bays and connectors specifically – inspect listing photos and seller ratings carefully, since a NAS with worn drive bay latches or a damaged network port is a worse deal than paying full price for new, even at a discount.
The Practical Recommendation
If you’re buying new and have no brand loyalty yet, the UGREEN NASync DXP4800 Plus is the one most worth a serious look this generation – the value proposition has genuinely closed the gap with the established leaders. If you’re already in the Synology ecosystem, the DS925+’s jump to standard 2.5GbE alone justifies choosing it over the outgoing DS923+ if you’re buying today. Don’t feel pressure to replace a working previous-generation NAS just because a newer one exists – the real upgrade trigger is a network throughput ceiling or CPU bottleneck you’re actually running into, not the calendar.
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