Originally Posted by kiwiasian
Found some blue LED Yate Loons for $6 each, which isn't too bad.
I thought fan controllers can send/receive RPM signals to/from the fan?
So it isn't getting undervolted but rather is just being told to run at a different speed?
I'm actually using blue LED Yate-Loon fans right now. The brightness goes with the fan speed, if that matters.
Most fan controllers don't send/receive RPM signals because of all the channels it splits. IME they come with an in-line adapter that you put between the fan and the controller that just shares the first and third pins, which are the RPM and the ground, which you'd plug into another mobo header to give RPM readings.
If a fan supports PWM (4 connector plug) then it doesn't need a controller, the mobo will control it. You can split this PWM signal into multiple PWM controlled fans with an adapter like Newegg sells which will split the signal AND add molex power, so you won't stress your mobo for power. The only controller I know of that supports PWM is the Sunbeamtech Rheosmart 6. Using traditional 3 pin fans with a controller, regardless of whether the controller is PWM or not, will be regulated by voltage. PWM fans straight off the mobo or with the first adapter I mentioned will not be externally voltage controlled, but controlled internally by the PWM signal to a microprocessor in the fan itself that will regulate (i.e. undervolt) itself internally as dictated by the PWM signal.