We might also mention that for cars with air conditioning, Derale provides the PWM Fan Controller with a/c override control, which kicks the fans up to 60 percent when commanded via a dedicated ...

However, PWM fans offer much more precise control over the exact speed of the fan. As mentioned above, both DC and PWM fans can vary their speed. However, a PWM fan can be controlled more precisely.

PWM or Pulse Width Modulation has generally been regarded as too complicated for PC fan speed control compared against using rheostats or linear voltage regulators such as the LM317.

4-Pin PWM Fan Hub Splitter 1 to 5 Power Supply Cable 5 Way PC Case Internal Motherboard Fan Power Extension Cable Cord Wire for Computer Case 4-Pin and 3-Pin Cooling Fans, 13 inch Black https ...

7) Custom designed PWM IC with SCD – Noctua’s custom-designed NE-FD1 is a next-generation PWM fan driver IC that integrates Smooth Commutation Drive (SCD) technology for quieter operation and ...

With the NF-F12 PWM fans, there just isn't anything at all to complain about. All I am left with is a great performing fan under even the toughest conditions of being bolted right next to a radiator.