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Possibility of Slowing down the speed of System Fans?

post #1 of 10
Thread Starter 
I got two new 60X60X38mm fan's that I ordered for my cousins computer and they are way too loud. They spin at 8,000rpm is there anykind of inline resistor that I can use to bring down the voltage or somthing that'll slow them down to about half speed. They blow out at about the same velocity as a hair dryer on low. And there is no danger of this cpu getting hot as the factory fans were only rated at 15cfm each and these are 50cfm but I know there higher than that.
    
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post #2 of 10
Thread Starter 
Oh before anyone suggest's speed fan non of those programs will work on this system. Been there try'd that.
    
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post #3 of 10
well. If they're connected to the mobo.
There maybe a chance that you can if your mobo supports it (I can think of a few utils.

-notebook hardware controlls, off the back of my head.

But if they're connected directly to a PSU molex.

.. no :\\
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post #4 of 10
You can buy a fan speed controller, that will allow you to vary the speed of the fans.
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post #5 of 10
They have to have speed control, no?

I dono, but you could always just get a fan controller and lower the settings...or you culd 7v mod them...or maybe even 5v...
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post #6 of 10
Get a few different value variable resistors (potentiometers) and see which range is best. Start with 1Kohm, 10kohm, 100kohm, and 1Mohm. If you want them really slow, plug them into the 5v pin on the molex connector.
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post #7 of 10
sry - I assumed you meant by software...


as the others are saying.. yeah. a controller would work.

Maybe you could MAKE one?

(PLLEase say YES ^_^ )
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post #8 of 10
Thread Starter 
A controler would be nice any ideas on where to put on at on a Dell Optiplex SX280 it's a small form factor. They are plugged into the motherboard directly. But with this dell there is no way for any software to control fan speed or even view temps. And there are no PCI slots to mount anything either it sucks hard core. And with the fans not plugged into the motherboard it will keep giving Fan1 and Fan2 failure warnings at post. But if I have to I could just tell him to hit F1 everytime after starting but would rather try'n avoid that.
    
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Sideburns View Post
They have to have speed control, no?

I dono, but you could always just get a fan controller and lower the settings...or you culd 7v mod them...or maybe even 5v...
How would I go about trying those mod's? That is if this motherboard can do it. http://support.dell.com/support/topi...=us&l=en&s=gen
Choose by model it's a Desktop, Optiplex, SX280 it's the 4th one from the bottom of list.
    
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post #10 of 10
The cheap route is to splice the fans to molex and flip the positive lead from one side to the other--that undervolts to 5V
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