120mm fans are widely supported in PC cases, radiators and tower coolers, but blade design and motor control target different resistance and noise conditions.
Compare airflow, static pressure, speed range, PWM or voltage control, bearing, thickness, current draw and lighting connector.
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Selecting the Right 120mm Fan
Open case vents favour free-air flow, while radiators and dense filters need pressure through resistance. Model-specific curves are more useful than one maximum figure.
Four-pin PWM fans accept a duty-control signal, while three-pin models may use voltage control on compatible headers. BIOS and controller support determine available speed range.
A low quoted minimum does not describe sound across the operating curve. Compare normalised tests and avoid unnecessary maximum RPM.
Every motherboard header has a current limit, and splitters combine fan draw. Add the amperage of all connected motors before wiring.
Twelve-volt four-pin RGB and 5V three-pin addressable RGB are electrically different. Some fan kits instead require a proprietary hub.
