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Is Increacing Fan Speeds to 90-100% Unnoticeable in a Power Bill? - Page 2

post #11 of 12
Quote:
Originally Posted by pLuhhmm View Post
It's that big of a difference going from 20% to 90-100% constant is it in terms of the power bill increasing? I'm trying to make sure anything I do with my PC doesnt increase the power bill, outside of just using it.


It will depend mostly on "How" the voltage is being controlled. A PWM controlled fan will save energy due to the fan being switched on and off.
During the off time little energy is being used. How ever voltage controlled, when the fan is set at say 9 volts, The 3 volts not used is released as heat through the resistance dropping the voltage. So a voltage controlled fan circuit will burn about the same watts at full speed as it does at half speed.

Hope this helps
Edited by Wile-E-Coyote - 3/12/11 at 4:57pm
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post #12 of 12
To add a little sauce to this chatter: gtx 480's specific blower fan uses 21.5 watts on full power.
Also, I don't get how fans are meant to last longer when used at full current? You are applying more power to equal the bigger inertia and friction.
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