Our Noctua NF-A14x25 G2 PWM Review shares a new addition of Noctua under its collection of 140mm fans. This recently released product follows the NF-A14 footprint while integrating the technology of NF-A12x25 PWM fans.
This PC fan has numerous features that maintain its impressive cooling performance while operating quietly. The product also integrates top-notch components to ensure efficiency, longevity, and quality. We tested it to share how it performs and what we experienced during this Noctua NF-A14x25 G2 PWM Review.
Noctua NF-A14x25 G2 PWM Review – Design and Functionality
Noctua developed the NF-A14x25 G2 PWM fan based on the NF-A14 PWM and NF-A12x25 PWM. It combines the technologies and design of the two latter fans while retaining the standard NF-A14 footprint. As a result, the company produced a new 140mm fan that delivers superior cooling performance.
One of the things we noticed while writing our Noctua NF-A14x25 G2 PWM Review was its colour scheme. This new 140mm fan is also brown, resembling previously released Noctua fans.
This fan has nine Progressive Bend Impellers. They prevent tip vortices and work with other frame features to maintain efficiency. Additionally, it uses AAO frames to reduce vibration.
This design combines Flow Acceleration Channels and winglets to enhance performance and maintain consistent efficiency gains.
We appreciate Noctua for always including all the cables and mounts necessary for installing the fan. These items made installation quick and easy before we tested the product for this Noctua NF-A14x25 G2 PWM Review.
Key Features of the Noctua NF-A14x25 G2 PWM
Enhancements for the Next Generation
The top-notch NF-A14 is one of the best 140mm fans, and Noctua received over a hundred awards for this product.
The company enhanced the award-winning fan with modern engineering to accommodate the latest cooling demands.
Highly optimised P/Q curve for all applications
Noctua engineered this product with aerodynamics to excellently maintain optimal airflow and pressure balance, particularly in the mid-range spectrum. This feature makes the fan versatile, excelling in static pressure and airflow-intensive applications.
Progressive Bend Impeller and Centrifugal Turbulator Hub
The impeller showcases a specialised blade structure optimised with Flow Acceleration Channels and integrated winglets for enhanced performance. It has nine blades sweeping back close to the hub while curving to the tips.
Pairing it with the Centrifugal Turbulator hub directs airflow to the outer blade areas for increased efficiency. These also ensure maximum lift and even load distribution across the blade span.
The hub improves the flow attachment and pushes air out via centrifugal driving motions.
Winglets for Reduced Vortices
This feature helps decrease tip vortices due to pressure differences between the fan blades. However, it can sometimes lower efficiency by displacing fluid in high-velocity areas.
To solve this issue, Noctua added precisely tuned winglets on the NF-A14x25 G2 PWM. The Progressive-Bend blade geometry, Flow Acceleration Channels, and AAO frame work harmoniously to ensure reliable and consistent efficiency improvements.
Ultra-tight Tip Clearance
It is another specific feature that allows the NF-A14x25 G2 to set a new standard for 140mm fans. It reduces leakage between the impeller and frame, boosting efficiency under back pressure conditions like heatsinks and radiators.
Sterrox LCP Compound
The NF-A14x25 G2 PWM uses Sterrox. This liquid crystal polymer compound reduces resonance and vibration and offers high tensile strength, damping features, and low thermal expansion coefficient.
AAO Frame
The Advanced Acoustic Optimisation frames offer better performance and noise efficiency. We noticed its benefits when the fan operated quietly during our tests for this Noctua NF-A14x25 G2 PWM Review. Although quiet, the fan delivered superior cooling to keep temperatures low.
The AAO frame uses two proprietary Noctua designs and innovations: the Inner Surface Microstructures and Stepped Inlet Design. This frame also features anti-vibration pads.
Anti-vibration Gasket and Pads
The NF-A14x25 G2 PWM includes an anti-vibration gasket and ultra-soft silicone pads with load-relief structures. These minimise deformations and vibration while ensuring compatibility with standard mounting systems.
SSO2 Bearing and Metal Bearing Shell
This cooling fan integrates the upgraded and enhanced SSO2 bearing. Noctua positioned the rear magnet of the fan close to the axis. It is necessary to improve stability, durability, and precision. In addition, it has a CNC-milled brass bearing shell for unparalleled manufacturing accuracy, minimal tolerance, and long-term reliability.
etaPERF Motor
The NF-A14x25 G2 features Noctua’s new etaPER motor, delivering exceptional energy efficiency through low electric impedance. Noctua positioned the rear magnet of the fan close to the axis. It is necessary to improve stability, durability, and precision.
Paired with Smooth Commutation Drive 2 technology, the motor maximises power output with minimal loss.
SupraTorque
SupraTorque is a unique Noctua technology that allows fans to use more torque headroom. It helps maintain RPM speed regardless of airflow resistance to ensure consistent system performance.
Smooth Commutation Drive 2
Noctua upgraded and improved this feature to lessen torque variations and switching noise. They did this to guarantee exceptional smoothness and silent operation when up close.
Broad Speed Range, Adjustable via PWM Control
Controlling the fan speed allowed us to tweak its operation during our tests for this Noctua NF-A14x25 G2 PWM Review.
The NF-A14x25 G2 PWM offers a broad speed range, allowing fine-tuned performance or near-silent operation. It works seamlessly with automatic temperature-based control or manual controllers like the NA-FC1.
Stops at 0% PWM
The fan stops entirely at 0% PWM duty cycle, making it perfect for semi-passive cooling setups. It stays silent during low thermal loads.
Low-Noise Adaptor
The company includes this type of adaptor to decrease maximum fan speed. It means you will get 1,250 from 1,500 rpm. This inclusion is ideal for quiet operation or capping speeds in automatic PWM mode.
Cutting-edge Protection
The PC fan can operate safely in challenging electrical environments caused by low electromagnetic emissions. It is safe from overvoltage, overcurrent, and reverse polarity.
This fan also has overloading protection and a locked rotor for enhanced safety.
Tested for Safety
Safety certifications make the NF-A14x25 G2 PWM the preferred choice over other cooling fans. It underwent strict tests for electrical safety, like other Noctua products.
This fan has TUV, UKCA, CE, and UL certifications and meets multiple safety standards, ensuring its impeccable quality.
More Cabling Options
With the 20cm primary cable, you can minimise cable clutter when installing the NF-A14x25 G2 PWM. Noctua also includes a 30cm cable for extended reach.
These fully sleeved cables feature a 4-pin Y-cable for connecting a second fan to the same PWM fan header.
Hands-on with the Noctua NF-A14x25 G2 PWM
The acoustic performance of the Noctua NF-A14x25 G2 PWM left a lasting impression during our tests for this Noctua NF-A14x25 G2 PWM Review.
Even at full speed, the noise levels remained within a comfortable range, with most of the output confined to the lower frequency spectrum. This made the fan unobtrusive, even in a quiet environment such as a home office or studio.
While there were some tonal peaks at higher RPMs, these were subtle and not disruptive, showcasing Noctua’s expertise in acoustic optimization.
At reduced speeds, the fan’s operation became virtually silent, making it ideal for workloads requiring minimal noise output, such as light gaming or office tasks. The absence of high-pitched tones further enhanced its acoustic performance, even during extended use.
On the cooling front, the NF-A14x25 G2 PWM demonstrated exceptional efficiency. It consistently maintained optimal temperatures under heavy system loads, outperforming many other fans in its class.
The fan’s broad airflow range made it suitable for cooling high-performance CPUs, GPUs, and even system-wide ventilation in larger cases. Its ability to adapt seamlessly to varying thermal demands ensured a smooth and consistent computing experience.
One of the standout features of this fan was its intelligent PWM control, which added a layer of efficiency to its operation.
During idle or low-load scenarios, the fan’s automatic speed adjustment allowed it to stop entirely when temperatures were sufficiently low. This not only reduced noise but also helped extend the fan’s lifespan by minimizing unnecessary wear.
In addition to performance and acoustics, the fan’s design and build quality further elevated its appeal. The NF-A14x25 G2 PWM is constructed using Noctua’s signature high-quality materials, ensuring durability and longevity.
Features like the Flow Acceleration Channels and the Sterrox LCP blade material contributed to its outstanding performance and quiet operation, even under demanding conditions.
Throughout our testing, the fan worked flawlessly, delivering on all its promises. Whether tasked with handling high thermal loads or maintaining silence during idle periods, the NF-A14x25 G2 PWM excelled in every aspect.
This fan is not only a testament to Noctua’s engineering prowess but also a reliable choice for users seeking premium performance without compromise. It is a must-have for enthusiasts and professionals who demand the best in cooling technology.
Noctua NF-A14x25 G2 PWM Review Summary
The Noctua NF-A14x25 G2 PWM fan continues Noctua’s tradition of delivering top-tier cooling solutions. Combining the NF-A14 footprint with advanced technologies from the NF-A12x25 PWM, this fan offers unmatched cooling efficiency while maintaining impressively low noise levels, even under demanding conditions.
Its features, such as the Progressive Bend Impeller, Sterrox LCP construction, and ultra-tight tip clearance, demonstrate Noctua’s dedication to innovation. These design enhancements ensure superior performance across various applications, from CPU cooling to system-wide ventilation. The broad PWM range and ability to stop at 0% PWM further enhance its versatility, making it suitable for both active and semi-passive setups.
Throughout our testing, the NF-A14x25 G2 PWM excelled in thermal management, maintaining low temperatures even under heavy loads. Its acoustic performance was equally impressive, with quiet operation that remained unobtrusive across different speed settings. These attributes make it an ideal choice for users who prioritise both performance and silence.
The NF-A14x25 G2 PWM is a standout fan that combines cutting-edge engineering, exceptional build quality, and a versatile feature set. Whether for enthusiasts seeking peak performance or professionals demanding reliable, quiet operation, this fan solidifies Noctua’s reputation as a leader in cooling solutions.
