It still is very common because all but the latest and greatest CPU coolers still use 3 pin fans. You know, the 10 years + before PWM fans were released? DC control was the common. Of coursed it wont, but PWM headers still allow DC based speed control (given a non half assed motherboard), which is more ideal over using a PWM converter because DC motors not designed for PWM control tend to tick really annoyingly.
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