TerraMaster F4-425 Pro NAS review: An improvement on predecessors, but falls short of what others are bringing to the same party

by · TechRadar

TechRadar Verdict

This is a NAS hamstrung by PCIe lanes. TerraMaster needed to break out of the bubble Intel created with the N305 and N350, but instead decided to extract the most from it. Compared to what others are offering at this price point, the F4-425 doesn’t quite cut it despite TOS 7.

Pros

  • +A more efficient CPU
  • +Three M.2 slots
  • +Dual 5GbE LAN
  • +TOS 7

Cons

  • -Maximum of 32GB of RAM
  • -Only Gen 3x1 M.2
  • -No 10GbE LAN port
  • -Lacks USB4 or Thunderbolt

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TerraMaster F4-425 Pro: 30-second review

TerraMaster has been making NAS hardware long enough to know that the upgrade cycle is everything. The F4-424 Pro arrived in early 2024 with a strong hand: an Intel Core i3-N305, 32GB of DDR5, and a build that put competitors under genuine pressure. Two years on, the company returns with the F4-425 Pro, and the result is a more complicated story than a straightforward generational step forward.

On the hardware side, the headline changes are meaningful. Dual 5GbE replaces the F4-424 Pro's dual 2.5GbE, which doubles the theoretical single-client throughput ceiling. The M.2 slot count increases from two to three. Both are welcome improvements that justify the refresh.

But there is a wrinkle. The processor moves from the Core i3-N305 to the Intel N350. The N350 is also an 8-core chip, and its maximum burst clock of 3.9GHz fractionally exceeds the N305's 3.8GHz. The difference is that the N350 is an Atom-architecture Alder Lake-N part rather than a Core-class one. Per-core performance and integrated GPU capability are both lower. The advantage is better power efficiency, but some will see this as a retrograde step.

The other major story for this platform is TOS 7. TerraMaster has rebuilt its operating system around an AI-first philosophy, with the OpenClaw assistant promising natural language control over 90% of common configuration tasks. That skirts the whole AI backlash, and those who don’t want to chat with their NAS, but equally, there are some that will embrace these features.

At £639.99, the F4-425 Pro sits in a remarkably competitive bracket. The Ugreen DXP4800 Pro offers a Core i3-1315U and a single 10GbE at £689.99. The Ugreen DXP4800 GT delivers dual 10GbE and ECC memory support at £589.99. The TerraMaster undercuts or matches both on M.2 count and brings a genuinely new OS story to the table. Whether that is enough depends on what the buyer most needs, but on spec alone, this isn’t one of the best NAS in this sector.

(Image credit: Mark Pickavance)

TerraMaster F4-425 Pro: Price and availability

  • How much does it cost? From $680/£586
  • When is it out? Available now
  • Where can you get it? Direct from TerraMaster or through an online retailer

The F4-425 Pro launched on 23 June 2026, available direct from TerraMaster, as well as retailers including Amazon.com, Amazon.co.uk, and B&H Photo.

At the time of review, the 8GB model is priced at $640 / £640 from TerraMaster and Amazon. Online retailer B&H Photo wants $644.99. And all these prices are without drives, obviously.

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