Noctua Unveils NF-A14x25r G2 PWM Fan: Redefining Performance for 140mm Cooling
With a drastically reduced tip clearance, advanced motor technology, and Noctua’s signature craftsmanship, the new round-frame model sets a new benchmark for efficient and quiet cooling.
VIENNA – Noctua, the Austrian manufacturer renowned for its premium cooling solutions, has announced the official release of the NF-A14x25r G2 PWM, the round-frame variant of its next-generation 140mm flagship fan. Building upon the foundation of its award-winning predecessors, this fan incorporates cutting-edge innovations in aerodynamics and acoustics to deliver exceptional performance for CPU coolers and case ventilation.
Designed specifically for optimal compatibility with Noctua’s own high-end air coolers like the NH-D15 G2, the round-frame “r” model ensures a perfect fit, addressing a key need for enthusiasts using these cooling solutions.
Precision Engineering for Superior Airflow
The NF-A14x25r G2 PWM features blades made from Noctua’s advanced Sterrox liquid crystal polymer (LCP) composite. This material offers greater stiffness and strength, ensuring superior dimensional stability under high rotational speeds. The blade design incorporates a progressive curvature that channels more air towards the highly efficient outer blade regions.
A standout engineering achievement is the drastically reduced tip clearance of just 0.7mm. This minimal gap between the blade tips and the frame—significantly smaller than the 1mm or more found in many competitors—minimizes airflow leakage, thereby boosting overall pressure and efficiency.
The fan also utilizes Noctua’s proprietary AAO (Advanced Acoustic Optimization) frame. This design includes stepped inlet grooves that help transition airflow from laminar to turbulent, increasing intake efficiency, and subtle inner-surface micro-grooves that suppress turbulent inflow separation to reduce intake noise.
Advanced Motor and Bearing System
At the heart of the fan is Noctua’s newly developed “etaPERF” motor, which integrates an NE-FD6 PWM IC and an ultra-sensitive Hall-effect sensor. This new motor delivers an estimated 10-15% efficiency improvement over the previous generation, resulting in higher torque output for the same power input or lower electrical power consumption for the same torque, contributing to better noise characteristics.
The fan is equipped with Noctua’s renowned SSO2 bearing. This second-generation self-stabilizing oil-pressure bearing system is designed for exceptional quietness, high operational precision, and an outstanding lifespan, rated for over 150,000 hours of operation.
Tailored SKUs for Different User Needs
Noctua is offering the NF-A14x25r G2 in several variants to suit different user preferences:
- Single Fan Standard Version (NF-A14x25r G2 PWM): Priced at €29.90 / $34.90 (approx.), it includes one fan and a comprehensive accessory set.
- Dual Fan Package (NF-A14x25r G2 PWM Sx2-PP): This kit contains two fans with a slight speed offset; one runs at a maximum of 1475 RPM (PPA), while the other runs at 1525 RPM (PPB). This speed differential is engineered to prevent acoustic beat frequencies and intermittent humming that can occur when two fans run at identical speeds in push-pull or side-by-side configurations, ensuring smoother acoustics without sacrificing cooling performance.
All versions come with a full suite of accessories, including low-noise adapters (NA-RC8/RC16), 4-pin Y-split cables (NA-YC1), extension cables, and anti-vibration mounts.
Performance and Application
| Size (Form factor) | 140 x 140 x 25 mm (round) |
|---|---|
| Speed range | 0 – 1500 rpm |
| Airflow (max.) | 155.6 m³/h (91.58 CFM) |
| Acoustical noise (max.) | 24.8 dB(A) |
| Static pressure (max.) | 2.56 mm H₂O |
| Rated voltage | 12 V |
| Connector | 4-pin |
| Colour | Brown |
Independent tests confirm that the NF-A14x25 G2 series delivers a significant performance uplift over its predecessor. The standard 1500 RPM version achieves a maximum airflow of 155.6 m³/h and a static pressure of 2.56 mmH₂O, with noise levels kept below 24.8 dB(A). In comparative testing with other 140mm case fans, the NF-A14x25 G2 PWM demonstrated leading performance in system-relevant metrics like noise-normalized airflow through case panels.
The round-frame NF-A14x25r G2 PWM is the ideal choice for users of compatible Noctua CPU coolers, while the square-frame NF-A14x25 G2 PWM variant offers broader compatibility for case mounting and radiator use.
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Backed by a 6-year manufacturer’s warranty, the Noctua NF-A14x25r G2 PWM is now available through authorized distributors. For enthusiasts demanding the ultimate in 140mm cooling performance and acoustics, this new fan represents a top-tier choice.
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