The NF-F12 is Noctua's first venture into a PWM fan, not because they never saw a need for one, but simply because they wanted to do it right and on their own terms. Noctua's NF-F12 implements a new PWM IC with SCD ( Smooth Communication Drive ). The NE-FD1 PWM IC basically gives smoother torque impulses giving you a quieter fan at lower speeds.

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