Noctua NF-A12x25 G2 PWM Sx2-PP chromax.Black, High-End Quiet Fans 2x120mm

The Noctua NF-A12x25 G2 PWM Sx2-PP chromax.Black is a dedicated two-pack of 120x25mm cooling fans engineered specifically for multi-fan setups. It solves the subtle humming and acoustic beating that often happens when identical fans spin at the exact same frequency. By slightly offsetting the speed of the two fans by approximately 50 RPM, this set targets smoother acoustics in dual-fan configurations.

The engineering focuses heavily on precision aerodynamics. Each fan utilizes a Progressive Bend impeller with winglets, Centrifugal Turbulators, Flow Acceleration Channels, and an AAO frame. Built from Sterrox liquid crystal polymer (LCP), the blades maintain an ultra-tight tip clearance to push air effectively through tight spaces. This makes the pair well suited for 240mm or 360mm water cooling radiators, push-pull configurations, or adjacent case intake and exhaust slots.

For system builders, the all-black chromax aesthetic eliminates the traditional beige-and-brown color scheme. The package includes practical mounting hardware: black anti-vibration mounts, standard fan screws, and a 12cm anti-vibration gasket designed to create a tighter seal against radiator surfaces. It also comes with a Low-Noise Adaptor (LNA), an extension cable, and a splitter cable for flexible motherboard connections. Internally, SSO2 bearings and built-in protections against reverse polarity, overvoltage, and overcurrent provide long-term electrical reliability.

As a trade-off, this pair is tailored specifically for paired use, meaning those who need an odd number of fans or individual replacements may find a multi-pack less practical. The data also does not mention any RGB lighting features, so it is strictly built for functional airflow and quiet operation rather than colorful illumination.

Verdict: The Noctua NF-A12x25 G2 PWM dual set is an outstanding pick for PC builders setting up 240mm or 360mm radiators or dual-intake slots. Its speed-offset engineering and robust accessory bundle make it an easy recommendation for anyone prioritizing quiet, high-efficiency cooling.

• Dimensions: 120x25mm per fan
• Quantity: 2 fans (dual set)
• Material: Sterrox LCP
• Bearing Type: SSO2 (MTTF > 150,000 h)
• Speed Offset: +/- ~50 RPM
• Safety Certifications: UL, TÜV
• Included Accessories: 12cm gasket, anti-vibration mounts, screws, LNA, extension cable, splitter cable

A great fit if you:

• Need two 120mm fans running side-by-side on a 240mm or 360mm liquid cooling radiator
• Want to run a push-pull fan setup without acoustic interaction issues
• Prefer an all-black aesthetic with matching anti-vibration accessories
• Value long-term reliability backed by SSO2 bearings and safety protections

Consider something else if you:

• Need only a single 120mm fan for your chassis
• Want integrated RGB lighting for your build

Why are the speeds of the two fans slightly offset?
The fans are offset by about 50 RPM to prevent acoustic interaction phenomena and resonance when they are mounted next to each other or in push-pull setups.

What accessories come in the box?
The package includes black anti-vibration mounts, a 12cm anti-vibration radiator gasket, standard fan screws, a Low-Noise Adaptor (LNA), an extension cable, and a splitter cable.

What material are the fan blades made from?
They are constructed from Sterrox liquid crystal polymer (LCP), allowing for ultra-tight tip clearance.

What electrical protections do these fans have?
They are protected against reverse polarity, overvoltage, and overcurrent short-circuits, and carry UL and TÜV safety certifications.