Terramaster F4-425 PLUS NAS Review

The Terramaster F4-425 PLUS NAS Review – The New $500+ NAS Standard?

The TerraMaster F4-425 Plus represents a significant step forward in the brand’s 4-bay NAS lineup, targeting users who demand capable hardware and broad feature support at a mid-range price point. Retailing at $569.99, or $484.99 during its introductory discount, it is positioned to compete directly with systems like the Synology DS925+ and QNAP TS-464, both of which occupy similar price and hardware tiers. TerraMaster’s intention with this model is to deliver a “jack of all trades” device that suits both home multimedia environments and small business offices. Internally, it uses Intel’s quad-core N150 processor, part of the newer Twin Lake architecture, with a base clock of 1 GHz and a turbo frequency up to 3.6 GHz. This CPU is paired with 16GB of DDR5 memory, offering a notable upgrade in bandwidth and responsiveness compared to previous DDR4-based TerraMaster models.

Complementing that performance core are three PCIe 3.0 x1 M.2 NVMe slots and four SATA drive bays, supporting a combined raw capacity of up to 144TB when fully populated. This configuration allows the device to accommodate both large-scale HDD storage for bulk data and high-speed SSD arrays for caching or dedicated performance pools. Dual 5GbE network ports on the rear enable theoretical aggregate transfer speeds exceeding 1,000 MB/s, aligning with the system’s positioning as a performance-focused yet affordable NAS. TerraMaster’s TOS 6 operating system comes preinstalled, providing modernized storage management, AI-based photo organization, and security tools like HyperLock WORM protection and isolation mode. Altogether, the F4-425 Plus arrives as one of the most fully featured mid-tier NAS options available in 2025, combining strong hardware, software maturity, and quiet, power-efficient design suited to both personal and professional use cases.

The Terramaster F4-425 PLUS NAS Review – Quick Conclusion

The TerraMaster F4-425 Plus delivers one of the most complete mid-tier NAS packages currently available, balancing strong hardware, efficient design, and flexible software at a highly competitive price. Its Intel N150 processor, 16GB of DDR5 memory, and dual 5GbE ports provide ample speed for data-heavy workloads, while three M.2 NVMe slots add rare versatility for caching or SSD-based pools. The all-metal enclosure maintains low temperatures and quiet operation, and the TOS 6 operating system has matured into a capable platform with snapshot protection, Docker, virtualization, and AI photo management. Although it lacks premium details such as drive locks and redundant fans, and the interface remains less refined than Synology DSM or QNAP QTS, the F4-425 Plus stands out as a practical and forward-looking NAS. It bridges affordability and professional capability, making it suitable for home users, content creators, and small offices that need reliable, fast, and adaptable network storage.

SOFTWARE - 7/10

HARDWARE - 9/10

PERFORMANCE - 8/10

PRICE - 9/10

VALUE - 10/10

8.6

PROS

👍🏻• Dual 5GbE network ports with full independent bandwidth for high-speed transfers + lots of USB-to-5GbE $30 upgrades in the market now
👍🏻• Three PCIe 3.0 x1 M.2 NVMe slots supporting cache or storage pool configurations
👍🏻• Intel N150 processor with integrated graphics enabling 4K hardware decoding and AES-NI encryption
👍🏻• 16GB DDR5 memory (expandable to 32GB) offering improved bandwidth and multitasking performance
👍🏻• Full-metal chassis with efficient thermals, low noise levels, and minimal vibration
👍🏻• Comprehensive RAID and storage management through TOS 6 with snapshot and HyperLock-WORM protection
👍🏻• Supports Docker, virtual machines, Plex, Emby, and Jellyfin natively within TOS 6
👍🏻• Competitive pricing with strong value relative to Synology and QNAP alternatives

CONS

👎🏻• Cheaper N150 NAS Systems have arrived earlier in 2025
👎🏻• 5GbE adoption is low, so only larger 10GbE ready groups (via auto-negotiation) will enjoy the benefits of 5GbE
👎🏻• TOS 6 interface and app ecosystem remain less polished than top-tier NAS platforms

Terramaster F4-425 PLUS NAS
Amazon in Your Region for the Terramaster F4 SSD NAS @ $569 ($489.99 till 19th Nov)	Terramaster F4-425 PLUS – $569	B&H for the Terramaster F4-425 plus NAS @ $569.99

The Terramaster F4-425 PLUS NAS Review – Design & Storage

The exterior design of the TerraMaster F4-425 Plus maintains the brand’s familiar compact metal chassis but introduces small refinements that improve both usability and thermals. Measuring 150 by 181 by 219 millimeters and weighing just under 3 kilograms, it fits comfortably into a home office or studio setup without generating significant heat or noise. The enclosure is almost entirely metal, with a brushed silver finish that enhances rigidity and passive cooling compared with earlier plastic-faced designs. Four individual drive trays occupy the front panel, each featuring a simple click-and-load mechanism for 3.5-inch or 2.5-inch drives. Although there are no locking latches or LCD displays, the trays are tool-free and straightforward to handle. A single 120mm fan at the rear provides adjustable cooling across smart, low, and high-speed profiles, maintaining an operational noise level as low as 20.9 dB(A) when idle with drives installed, according to TerraMaster’s own test figures.

From a structural perspective, the F4-425 Plus has clearly benefited from improved thermal management. The metal shell acts as a heat spreader, with typical external temperatures ranging from 25 to 27°C across the enclosure after extended operation, even under multi-day workload testing. Internal drive bays were observed to maintain around 27 to 29°C, while the rear ports and fan area registered between 36 and 38°C during prolonged use. These figures indicate an efficient heat dissipation design, aided by the more conductive chassis material and smart fan calibration. For users concerned with energy efficiency, the power draw remains modest thanks to the Intel N150 processor’s low TDP, allowing the system to idle at roughly 13 watts with SSDs installed and scale to around 60 watts under sustained load with four enterprise-class HDDs spinning.

In terms of drive configuration, the NAS supports up to four SATA 6Gb/s drives and three M.2 2280 NVMe SSDs. This combination provides a theoretical maximum raw capacity of 144TB, assuming four 30TB HDDs and three 8TB SSDs. The inclusion of three NVMe slots rather than the more typical one or two is a notable strength. Each operates on a PCIe 3.0 x1 lane, delivering real-world throughput of approximately 800 to 900 MB/s per SSD, suitable for caching or storage pools. This setup makes it possible to allocate two drives for cache acceleration while dedicating the third to an independent SSD-based pool for high-speed operations like video editing or database hosting. Such flexibility is rare at this price point and broadens the system’s appeal to users with both large data sets and high-performance requirements.

Storage management is handled through TOS 6, TerraMaster’s web-based operating system, which supports a wide range of RAID configurations including TRAID, TRAID+, JBOD, and traditional RAID 0, 1, 5, 6, and 10. TOS 6 also enables SSD caching, snapshots, and HyperLock write-once-read-many functionality for data integrity. Users can assign storage pools to specific workloads, such as separating SSD-based scratch space from HDD archival volumes. Combined with the new graphical interface and more detailed health monitoring tools, it provides a much more transparent overview of drive temperatures, utilization, and S.M.A.R.T. status. For additional flexibility, the system supports online RAID migration and expansion, meaning users can start small and scale capacity over time without data loss.

Beyond local storage, the device integrates directly with TerraMaster’s CloudSync service, which connects to providers like Google Drive, OneDrive, Dropbox, and Baidu Cloud. Hybrid storage configurations allow partial replication or tiered backup between the NAS and the cloud, offering an extra level of redundancy for professional workflows. External connectivity through USB 3.2 ports also supports direct backups to DAS enclosures or portable drives. Altogether, the F4-425 Plus’s design emphasizes efficient cooling, solid construction, and versatile storage architecture, making it a flexible foundation for both data-heavy projects and long-term digital archiving.

The Terramaster F4-425 PLUS NAS Review – Internal Hardware

Internally, the TerraMaster F4-425 Plus is structured around Intel’s N150 processor, a 4-core, 4-thread CPU from the Twin Lake generation. Built on a 6W TDP architecture, this chip delivers a significant efficiency advantage over the previous N5095-based systems while offering a higher burst clock of up to 3.6 GHz. The CPU integrates Intel UHD Graphics, allowing 4K hardware decoding for H.264, H.265, VC-1, and MPEG-4, which is particularly beneficial for Plex, Emby, or Jellyfin users who want native transcoding without GPU add-ons.

This combination makes the system viable not only as a file server but also as a local multimedia hub, capable of decoding and streaming 4K video at up to 60 frames per second. Despite being a low-power chip, its instruction set includes AES-NI hardware encryption, ensuring efficient data security without notable throughput loss when encryption is enabled.

The system’s memory architecture uses a single DDR5 SO-DIMM slot, populated with a 16GB non-ECC module by default and expandable up to 32GB. The adoption of DDR5 over DDR4 marks a generational improvement in bandwidth and latency, leading to faster multitasking, smoother virtualization performance, and reduced overhead when handling multiple users or services. The memory module is non-ECC but benefits from on-die error correction at the hardware level, offering stability improvements over standard DDR4 implementations. This approach aligns with the unit’s target demographic of small offices, creators, and advanced home users who want server-grade responsiveness without enterprise complexity.

Storage connectivity within the system is distributed between four SATA III 6Gb/s interfaces managed by an ASMedia controller and three PCIe 3.0 x1 lanes dedicated to M.2 NVMe SSDs. This configuration ensures balanced throughput for simultaneous HDD and SSD activity. Internally, the layout is straightforward, providing easy access to both the memory slot and M.2 bays via the removable top panel. The power supply is a single 90W external brick, keeping internal temperatures lower and simplifying maintenance.

Together, the hardware configuration represents a thoughtful balance between efficiency, expandability, and performance, aimed at users who need consistent data access, multimedia capabilities, and reliable long-term operation without excess noise or heat.

The Terramaster F4-425 PLUS NAS Review – Ports and Connections

The TerraMaster F4-425 Plus offers a broad range of connectivity designed to meet both high-speed networking and general expansion needs. On the rear panel, two 5GbE RJ-45 network ports serve as the central performance feature. These are among the first dual 5GbE implementations in a mid-tier NAS, and each port operates through its own dedicated PCIe 3.0 x1 lane, avoiding bandwidth contention. In testing, each port achieved full theoretical throughput, confirming proper lane allocation. Users can enable link aggregation or SMB multichannel for multi-user workloads, although saturating both ports simultaneously requires fast SSD or hybrid storage configurations. These ports support IPv4/IPv6, VLAN tagging, link aggregation, and Wake-on-LAN, making the system suitable for both small office environments and direct workstation connections.

Complementing the network interfaces, the F4-425 Plus includes four USB 3.2 ports: three Type-A and one Type-C, all operating at 10Gbps. These ports can handle external DAS enclosures, UPS devices, or high-capacity backup drives. The inclusion of a front-mounted USB port improves convenience for ad hoc backups or quick file transfers, addressing a long-standing omission in earlier TerraMaster models. Additionally, an HDMI 2.1 output is positioned on the rear, though its practical use remains limited within TOS, which lacks a native display interface. It may, however, prove useful for third-party operating systems such as Unraid or TrueNAS, where direct console access or local media playback is desired.

Overall, the port layout is clean and efficient, optimized for straightforward cable management. The system’s single large fan sits adjacent to the networking array, allowing for effective airflow without excessive cable obstruction. Power is supplied through a standard barrel connector linked to an external 90W adapter, which helps reduce internal heat buildup. Though it lacks built-in 10GbE or PCIe expansion, the dual 5GbE setup provides more than enough bandwidth for its class, especially when paired with NVMe caching. Users can also connect the NAS to TerraMaster’s USB-based DAS units for storage expansion or off-site replication, offering flexibility without compromising portability or noise levels.

The Terramaster F4-425 PLUS NAS Review – Tests, Noise, Heat and Power Consumption

Performance testing on the TerraMaster F4-425 Plus showed that the system comfortably meets its advertised speed class, particularly when networked over a single 5GbE connection. Using four Toshiba MG-series 7200 RPM enterprise hard drives configured in RAID 5, the system achieved full saturation of one 5GbE port during both AJA and ATTO benchmark tests, reaching consistent read and write speeds around 500 to 520 MB/s. When tested with mixed media files totaling 50.5 GB, it completed the transfer in approximately 3 minutes and 45 seconds, equating to an average throughput of about 224 MB/s.

This is a strong result for a mechanical-drive setup, reflecting efficient caching and balanced SATA bandwidth. SMB Multichannel and link aggregation are supported, though the CPU’s available PCIe lanes limit simultaneous dual-port saturation. Even so, the system handles multiple concurrent transfers and backups without a noticeable decline in throughput.

Testing with NVMe SSDs improved overall responsiveness considerably. The three M.2 2280 PCIe 3.0 x1 slots each sustained sequential transfer rates between 800 and 900 MB/s, allowing the NAS to maintain a high level of random IOPS for metadata-heavy workloads. When used as cache devices, these drives accelerated small-file transfers and application access times, especially when paired with the system’s 16GB of DDR5 memory.

TerraMaster’s TOS 6 supports flexible use of these drives, enabling independent storage pools or hybrid cache layers, depending on the task. In sustained transfers over SMB and iSCSI, the system achieved write speeds close to 950 MB/s and reads near 1020 MB/s when using SSD-based arrays, validating the advantage of dual 5GbE interfaces for all-flash or mixed-tier environments.

Power consumption during operation remained modest, aligning with the platform’s efficient design. With no hard drives installed and three SSDs active, idle draw measured around 13.3 watts. Adding four 7200 RPM HDDs increased idle power to 55 watts and full-load consumption to roughly 61–63 watts under concurrent read/write activity. These figures indicate a well-balanced design that prioritizes power efficiency without restricting performance. Fan speed settings affect both thermals and acoustics predictably: in low-speed mode, the NAS operated near 33 dB(A), while mid and high-speed profiles raised that figure to 37 and 39 dB(A) respectively. During heavy disk operations, readings peaked briefly at around 43 dB(A), which is reasonable given the metal chassis and high-RPM drives used in testing.

Thermal results further underscored the system’s stability. Surface readings from the aluminum body remained between 25°C and 27°C on average, while drive bays hovered at 28–30°C after extended workload sessions. The rear fan exhaust area reached approximately 36–38°C under sustained load. The efficient heat dispersion of the chassis prevented thermal throttling during prolonged transfers or virtualization testing, even with all seven storage devices active. This consistent temperature range indicates that TerraMaster’s choice of single-fan cooling and full-metal housing achieves a practical balance between noise, airflow, and longevity.

The Terramaster F4-425 PLUS NAS Review – Verdict and Conclusion

The TerraMaster F4-425 Plus demonstrates how far the company’s mid-range NAS lineup has progressed in terms of hardware refinement and real-world usability. By combining Intel’s efficient N150 processor with 16GB of DDR5 memory, dual 5GbE connectivity, and triple M.2 NVMe slots, it provides a specification normally reserved for higher-priced units. The build quality, centered around a full-metal chassis and quiet cooling design, contributes to consistent thermals and low power usage even under multi-day workloads. While the design omits premium touches like drive locks or redundant fans, the emphasis on practicality and efficient cooling makes it a dependable solution for continuous operation. From a user experience perspective, the integration of TOS 6 represents TerraMaster’s most stable and capable operating system to date, offering improved security features, cloud synchronization tools, snapshot management, and flexible storage configurations that appeal to both home and small office users.

From a value standpoint, the F4-425 Plus stands out as one of the most competitively priced NAS units in its category. At $569.99, or $484.99 during the initial discount period, it delivers strong network and storage performance that aligns closely with rivals from Synology and QNAP while retaining open installation flexibility for third-party platforms such as Unraid or TrueNAS. Its combination of high-speed connectivity, compact design, and mature software environment makes it an appealing option for anyone seeking a 4-bay system capable of multitasking across media streaming, data backup, and light virtualization. Although it cannot fully match the polish of Synology DSM or the plugin ecosystem of QNAP QTS, TerraMaster has successfully positioned this device as a bridge between affordability and professional performance, solidifying its place as one of the more balanced NAS releases of 2025.

Terramaster F4-425 PLUS NAS
Amazon in Your Region for the Terramaster F4 SSD NAS @ $569 ($489.99 till 19th Nov)	Terramaster F4-425 PLUS – $569	B&H for the Terramaster F4-425 plus NAS @ $569.99

Terramaster F4-425 PLUS NAS PROs

Terramaster F4-425 PLUS NAS CONs

• Dual 5GbE network ports with full independent bandwidth for high-speed transfers + lots of USB-to-5GbE $30 upgrades in the market now • Three PCIe 3.0 x1 M.2 NVMe slots supporting cache or storage pool configurations • Intel N150 processor with integrated graphics enabling 4K hardware decoding and AES-NI encryption • 16GB DDR5 memory (expandable to 32GB) offering improved bandwidth and multitasking performance • Full-metal chassis with efficient thermals, low noise levels, and minimal vibration • Comprehensive RAID and storage management through TOS 6 with snapshot and HyperLock-WORM protection • Supports Docker, virtual machines, Plex, Emby, and Jellyfin natively within TOS 6 • Competitive pricing with strong value relative to Synology and QNAP alternatives

• Cheaper N150 NAS Systems have arrived earlier in 2025 • 5GbE adoption is low, so only larger 10GbE ready groups (via auto-negotiation) will enjoy the benefits of 5GbE • TOS 6 interface and app ecosystem remain less polished than top-tier NAS platforms

 

 

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