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Noctua NF-A12x25 G2 PWM Sx2-PP, Dual Fan Set for Push-Pull and Side-by-Side Applications (Brown)
- Next-gen 120x25mm design for unprecedented quiet cooling performance in both high airflow and high static pressure applications: ideal as a PC case fan, on CPU coolers and water cooling radiators!
- State-of-the-art engineering (Progressive Bend impeller with winglets and Centrifugal Turbulator, Flow Acceleration Channels, AAO frame) and construction (Sterrox LCP, ultra-tight tip clearance)
- Dedicated push-pull set (Sx2-PP) with two NF-A12x25 G2 PWM 120x25mm fans that are slightly off-set in speed (+/- ~50rpm) in order to avoid undesired acoustic interaction phenomena
- Ideal choice for push-pull applications as well as situations where two or more fans are operating side by side (240 or 360mm water cooling radiators, case intake or exhaust fans, etc.)
- Trusted Noctua quality with premium-grade SSO2 bearing (MTTF > 150,000 h), safety certifications from UL and TÜV, protected against reverse polarity, over voltage and over current (short-circuits)
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Overview
Specs
Reviews
The NF-A12x25 G2 PWM Sx2-PP is a set of two NF-A12x25 G2 PWM 120mm fans that are offset in speed, which can be beneficial in push-pull operation as well as in situations where two or more fans are operating side by side, such as in case cooling applications or on 240 and 360mm water cooling radiators.
When two fans are running at almost the same, constant speed in a push-pull configuration or, albeit to a lesser extent, side by side, their acoustic interaction can lead to undesirable harmonic phenomena such as intermittent vibrations or periodic humming due to interference, which can be heard as beat frequencies. Therefore, the two NF-A12x25 G2 PWM fans contained in the Sx2-PP set are slightly offset in speed (+/- ~50rpm) in order to avoid such phenomena.
This fine-tuning is made possible by the fans novel etaPERF motor and its NE-FD6 driver IC that achieves extremely precise speed control and, thanks to its SupraTorque feature, can leverage extra torque headroom to keep the exact desired speed even when working against significant flow resistance such as on water cooling radiators and heatsinks. With one fan running ~50rpm slower (PPA) and one ~50rpm faster (PPB), the overall cooling performance can be kept the same while efficiently preventing intermittent vibrations or periodic humming.
Since the perception of beat frequencies can vary depending on psychoacoustic preferences, users can easily further optimise acoustics by slowing the PPA fan down a little more through PWM control or the supplied Low-Noise-Adaptor, which will result in an even smoother sound signature due to the increased offset.
If more than two fans are running side by side, customers can either combine multiple Sx2-PP sets or add a single NF-A12x25 G2 PWM fan and reduce its speed to the level of the PPA model (~1750rpm) using PWM control in order to make sure that neighbouring fans are never running at the same speed.
Warranty & Returns
Warranty, Returns, And Additional Information
Return Policies*
- Return for refund within: 30 days
- Return for replacement within: non-replaceable
- This item is covered by Noctua Cooling Solutions Return Policy
- *Subject to applicable law
Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.
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The Noctua NF-A12x25 G2 PWM Sx2-PP is a brown two-fan set of 120 × 25 mm PWM fans designed for quiet, high-performance cooling, making it suitable for PC builders who want airflow on a case, CPU cooler, or water-cooling radiator.
Recommended For
- Builders cooling a 240 or 360 mm radiator who want a matched two-fan set for side-by-side use, with airflow suited to restrictive cooling surfaces.
- Custom-loop or radiator builders using a push-pull layout who want two fans specifically packaged and speed-offset for that arrangement.
- Noise-conscious PC builders who want to tune 120 mm case or CPU-cooler airflow with PWM and prioritize tested cooling performance at controlled noise levels.
- Builders replacing two adjacent case fans who want a coordinated pair for intake or exhaust rather than selecting two separate fans.
Real-World Use Scenarios
- Replacing the fans on a 240 mm AIO radiator: the two 120 mm fans fit side by side, and testing on radiators suggests the G2 can balance cooling and noise; actual results depend on the cooler and fan curve.
- Adding a second fan to a compatible CPU tower cooler for push-pull: the pair can help move air through the heatsink under CPU load, while the speed offset is intended to reduce the chance of periodic humming between the fans.
- Setting up two case fans as front intake or rear exhaust: they provide a straightforward way to refresh case airflow, and PWM control lets users tune fan speed to the system’s cooling and noise needs.
- Building a quieter PC with two neighboring fans: because the pair runs at slightly different speeds, it is designed to lessen the intermittent humming or vibration that can occur when nearby fans run at nearly identical speeds; the result can vary with the installation and listening conditions.
- Tuning radiator or case cooling for a quieter everyday PC: users can lower PWM speeds to trade some maximum cooling capacity for less fan noise; independent testing found the G2 suitable for both radiator and case-fan use, but the best setting depends on the build and workload.