Noctua NF-A12x25 G2 SX2 CHBK, 120mm, PWM, SSO2 Bearing, Fan Kit, 2-pack, Black

The Noctua NF-A12x25 G2 PWM SX2 CHBK is a 120 mm twin-fan kit designed for liquid-cooling radiators or dense case enclosures. The two fans are tuned for use in a push-pull configuration, featuring a 50 RPM speed offset between them. This offset prevents harmonic interference, which can cause a pulsing hum in symmetrical setups. Both units use a standard 4-pin connector, allowing motherboard headers or external controllers to regulate speed based on system temperatures. Their SSO2 bearing motors ensure stable rotation under continuous load.

The fans feature a "Progressive Bend" impeller design and a "Centrifugal Turbulator" hub. These elements stabilize airflow and reduce turbulence when air passes through radiator fins. The housing and blades have a black finish for a low-profile aesthetic, and the design omits LEDs to maintain an understated appearance. The 120 mm sizing is compatible with most standard PC cases and cooling hardware. The kit includes additional components for cable management and vibration-dampened mounting.

• 107.3 cfm maximum airflow: Provides high air volume for cooling components.
• 3.14 mmH2O maximum air pressure: Effectively forces air through restrictive environments like thick liquid-cooling radiators.
• 0–1800 RPM operational range: Allows for quiet operation at idle and high performance under load.
• 22.5 dB high-speed noise level: Maintains low acoustic output even at maximum rotation.
• Anti-vibration mounting hardware: Includes eight silicone mounts and two radiator gaskets to prevent chassis vibration.
• Comprehensive cabling kit: Includes a splitter cable and two 30 cm extensions for flexible motherboard routing.
• Low-Noise Adaptors: Includes two cables to manually limit top fan speeds for noise-sensitive setups.