Noctua Releases NF-A14x25 G2 PWM Fan: Redefining the 140mm Fan Performance Benchmark

With a significantly reduced tip clearance, advanced motor technology, and Noctua's signature craftsmanship, this new square-frame model sets new standards for efficient and quiet cooling.

Austrian cooling solution manufacturer Noctua has officially announced the next-generation NF-A14x25 G2 PWM fan. This square-frame version marks the full entry of Noctua’s 140mm fan series into its second generation, following the release of the round-frame model (NF-A14x25r G2 PWM) in July.

While maintaining the standard 140×140×25mm dimensions, the new product incorporates multiple technological innovations designed to provide users with superior thermal performance and noise control.

—

01 Precision Engineering and Technological Innovations

The NF-A14x25 G2 PWM utilizes blades made from a new Sterrox Liquid Crystal Polymer material, which significantly increases stiffness and strength, ensuring stability and durability during high-speed operation. The blade design features a progressive curvature that helps channel air towards the more efficient outer blade regions.

A standout technological breakthrough is the reduction of the tip clearance to just 0.7mm. This gap, far below the industry average, effectively reduces airflow leakage and improves cooling efficiency. In comparison, the tip clearance of many high-end fans on the market is typically around 1mm.

The fan also incorporates Noctua’s unique AAO frame design, which includes stepped inlet grooves and micro-grooves on the inner surface. The former increases turbulence flowing into the blades, promoting the transition from laminar to turbulent flow; the latter suppresses airflow separation sucked in from the blade tips, thereby reducing intake noise during operation.

02 Advanced Motor and Bearing System

The NF-A14x25 G2 PWM is equipped with Noctua’s newly developed “etaPERF” motor, which integrates an NE-FD6 PWM IC and an ultra-sensitive Hall effect sensor. Compared to the previous single-phase fan motor driven by the NE-FD1 IC, the new technology can achieve higher torque at the same power consumption, or consume less electricity to achieve the same torque value.

Official data indicates that the average efficiency improvement of the etaPERF motor ranges from 10% to 15%. This enhancement translates to better power conversion efficiency and superior performance regarding motor noise.

For the bearing system, the fan uses Noctua’s signature SSO2 self-developed bearing technology. This technology employs a metal bearing housing and a new injection molding process that allows the magnet to be closer to the rotor axis. A stable magnetic field exerts a greater magnetic force on the rotor shaft, resulting in higher operational precision and a longer service life.

03 Multiple Versions for Different Needs

Noctua offers the NF-A14x25 G2 series in several versions to meet diverse user requirements:

• Standard Version (NF-A14x25 G2 PWM): Priced at $39.90 (approx. CNY 279), it includes one fan and a rich set of accessories.
• Low-Speed Version (NF-A14x25 G2 LS-PWM): The maximum speed is reduced to 800 rpm, with noise levels kept below 11.4 dB(A), making it ideal for users seeking extreme quietness.
• Dual-Fan Package (NF-A14x25 G2 PWM Sx2-PP): Priced at $76.90 (approx. CNY 538), it contains two fans with a slight speed offset.

The dual-fan package employs a speed offset design (PPA at 1475 rpm, PPB at 1525 rpm) aimed at reducing intermittent vibration or periodic humming that can occur when fans are installed in push-pull or side-by-side configurations. This subtle speed difference prevents adverse acoustic interference phenomena, such as beat frequencies, while maintaining overall cooling performance.

All versions come bundled with a comprehensive set of accessories, including low-noise adapters, 4-pin Y-split cables, extension cables, anti-vibration pads, and fan screws, offering users considerable installation flexibility.

04 Performance and Practical Application

According to third-party test data, the NF-A14x25 G2 series shows a significant performance improvement over its predecessor. Under no-obstruction/no-load conditions, the fan can deliver immense airflow, even surpassing the performance of many other fans running at 1500 rpm when operating at medium-low speeds of around 1000 rpm.

Regarding noise control, the NF-A14x25 G2 PWM operates almost silently at speeds below 850 rpm. Noctua’s official data states that the standard version has a maximum speed of 1500 rpm, a maximum airflow of 155.6 m³/h (approx. 91.65 CFM), a maximum static pressure of 2.56 mmH₂O, and a noise level kept below 24.8 dB(A).

The low-speed version further optimizes quiet performance, with a maximum speed of 800 rpm and a maximum noise level of only 11.4 dB(A), which can be reduced to 8.6 dB(A) using the included low-noise adapter, providing an ideal solution for noise-sensitive environments.

In terms of practical application, the square-frame design gives the NF-A14x25 G2 PWM broader compatibility compared to the round-frame version. It is not only suitable for Noctua’s own air coolers but can also be easily installed on liquid cooling radiators and as a case fan, making it a versatile choice for various cooling scenarios.

—

The release of the NF-A14x25 G2 PWM fan completes Noctua's second-generation 140mm fan product line. Its 6-year warranty and a rated lifespan of over 150,000 hours further demonstrate Noctua's confidence in the product's quality.

For DIY users seeking the ultimate in cooling performance and acoustic experience, this new product undoubtedly stands as a top-tier choice in the current 140mm fan market.

Press Release Note: This article is based on information from Noctua’s official product page and incorporates data from authoritative media reviews to accurately reflect the product’s features and performance. All key data are from verifiable sources, ensuring the objectivity and accuracy of the press release.