PWM fans are more power efficient (although I can't imagine them saving you more than a few watts). I think a given
PWM may have a lower minimum speed than an 'equivalent' non-
PWM fan, but non-
PWM fans can still run slow enough. For the average consumer I can't think of much reason to prefer one over the other.
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PWM usually merely offers increased functionality ranges (some going as low as 20%). but no. you really don't need PWM for case fans. whether or not you want better case fans is up to you, but to make that decision solely on using 3 pin or 4 pin fans is largely irrelevant.Nov 26, 2017
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PWM fans are typically capable of going to much lower minimum speeds compared to DC, they can typically dip down to 20% or lower. Whereas DC is typically in the 40-60% range for minimums. DC controlled fans require a minimum voltage to spin continuously. The minimum voltage threshold varies depending on the fan model.
