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Do fan controllers save or waste energy? - Page 2

post #11 of 17
Thread Starter 
Quote:
Originally Posted by Electrocutor View Post

Undervolting fans to reduce their speed and noise does not save power. (Ohm's Law)

PWM fans do save power because they are actually turned off between pulses and use the full 12v.

If that's true, I'm definitely going that route. Order the PWM splitter, seems like it fits my needs just fine. Thanks guys.
post #12 of 17
Fan controllers are great! I love the toggle switches on mine. Considered upgrading to a fancier model but I like flipping them up and down because when they are on full power, its like a jet engine taking off xD
 
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post #13 of 17
You could also just run the fans directly from the power supply on either 5v or 7v. That way you don't lose energy due to a fan-controller.
post #14 of 17
Thread Starter 
Quote:
Originally Posted by Juraat View Post

You could also just run the fans directly from the power supply on either 5v or 7v. That way you don't lose energy due to a fan-controller.

Sorry,not too familiar with the idea. How does this method work? Are there certain power supply wires that only provide 5v?
post #15 of 17
I think compared to overclocked CPUs, GPUs, power supplies, RAM etc etc a fan controller is the least of my worries wink.gif
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post #16 of 17
Thread Starter 
Quote:
Originally Posted by Kane2207 View Post

I think compared to overclocked CPUs, GPUs, power supplies, RAM etc etc a fan controller is the least of my worries wink.gif

Not worried, just curious really :-)
post #17 of 17
Quote:
Originally Posted by detunedstring View Post

Sorry,not too familiar with the idea. How does this method work? Are there certain power supply wires that only provide 5v?

Molex connections have 3 colors of cables. 1 yellow, 2 black and 1 red. The yellow wire is the 12V wire, the 2 black ones are ground and the red one is 5V. So when connecting a fan to the red cable and a black cable, it will run on 5V. When connecting the fan to the 12V and using the 5V as ground, you will have it running on 7V. Here's a youtube clip that shows how it's done. It's in German though, but I guess it's good enough to show you what is done to achieve this. Link
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