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PWM stands for Pulse Width Modulation. The 4-Pin connector allows the mainboard to control the fan speed from 800-1500RPM. Optimum airflow, air pressure & extremely silent performance. Innovative blade design focus air flow & optimum cooling efficiency (Patent). Air-inlet with optimal aero-dynamical design reducing noisy air turbulences. Rubber fixed pins also reduces vibrations (fan run more quietly) and Tool-less makes it easy to mount, with no tools required
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