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I just plugged a 3 pin fan header into a 4pin fan header and somehow still have full control over

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Go to solution Solved by Skiiwee29,

You're controlling it via DC voltage, not PWM signal. 

I plugged a 3 pin fan header to a 4pon header how do I still have control over it, as I have seen that you can't, just curious if anyone can explain, thanks :) 

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You're controlling it via DC voltage, not PWM signal. 

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It’s being controlled directly by voltage, ie you’re seeing the system provide more or less power to the motor directly rather than by using the PWM signal to control fan speed.

PWM allows for RPM accurate measurement and speed control, voltage controlled fan speed isn’t tracked accurately and doesn’t have an accurate stepping.

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