One solution to these problems is to smooth the PWM signal with a low-pass filter and use that voltage to control a linear driver. For a 12-V fan, the resulting control voltage is typically 5 V to ...

The fan then runs at the same speed it would if driven directly by the PWM signal, though it can now turn off completely when not required.

I thought for sure my new Ivy Bridge build would feature PWM fan control. I was mistaken. My Gigabyte GA-Z77X-UD5H has the same features as the Asus board for $100 less - but the PWM is lame ...

Its electronics can control the fan speed automatically with the temperature level, and it also has a fan stall alarm feature. The module, specifically designed for standard 12V (4-wire) PC/CPU ...

NZXT launches its GRID+ V2 digital fan controller enabling individual control and fault analysis of six PWM fans.

All models come with Low-Noise Adaptors, 30cm cable extensions and 4-pin y-cables that allow to connect a second PWM fan to the same fan header for automatic control.