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Thread: CPU fan, PWM, Capacitors. Help.

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    Question CPU fan, PWM, Resistors. Help.

    Hi guys. Hopefully i would get my answer or solution here.

    I need to attach a capacitor (or anything else) on the HSF.

    The motherboard is Asus P5KPL-AM SE. It came with a problem that the CPU fan keeps running on 100%, otherwise the motherboard is fine. I gave it in warranty but no use. Fools think this is normal.

    Anyways i am tired of all that and now its time to do something by myself. Can anyone of you help me with this? What products do i need? and other what to do's? I have a friend who has a repairing shop, so soldering or anything else i can ask him for it. But i am not asking this specific question from him as he doesn't deal in computers, even if he can help me, but i wont.

    I want the fan to run at below 1800rpm as above this it gets loud, at 100% things are definitely loud! its a 80mm fan.

    I wont be cutting the HSF wires, I will get a 4pin extender so i can attach whatever is necessary on it.
    Last edited by Serious Sam; 09-05-2011 at 08:06 AM.

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    Don't bother.. first of all check all your bios settings and see if everything's in order there, than do a bios update and see if that fixes it and if it doesn't, buy a cheap fan controller and simply bypass that fan connector..
    "Sometimes a cigar is just a cigar" - Unknown (but sometimes attributed to Sigmund Freud)

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    I knew someone will troll like this.

    You shouldn't jump on conclusion that one is an amateur. I have done everything one can do, but its the same. and i am not getting a fan controller for this. The cheapest will cost me 100x more than adding a capacitor here.

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    Quote Originally Posted by Serious Sam View Post
    I knew someone will troll like this.
    You're also a visionary.. what exactly do you expect to achieve by adding a cap to a fan!?
    "Sometimes a cigar is just a cigar" - Unknown (but sometimes attributed to Sigmund Freud)

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    Capacitor?

    Maybe you thought about RESISTOR?

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    Smile

    Quote Originally Posted by rafal_iB_PL View Post
    Capacitor?

    Maybe you thought about RESISTOR?
    Maybe? I am not studying Electrical Engineering so yes i am not good with terms. That's why i came here to people who know about this. Please tell more dude. Thanks.

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    Come on come on. Dont have time, Need quick help.

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    What you need is a resistor or a potentiometer (variable resistor) - when you add one to the fan, the fan will no longer receive 12 volts but a bit less, therefore it won't spin that fast.

    Resistance value = Voltage / I - voltage is 12 v , i is the number that ends in A on the label of the fan - generally it's around 0.1-0.3A for regular 80mm fans.

    Assuming 0.15A, you're looking at about 80 ohm, so a 100 ohm potentiometer should be enough:

    http://www.amazon.com/100-Linear-Tap...3265794&sr=8-1

    Link is just to see how it looks, you should find them easily in retail stores around you.

    If you want something cheaper, just buy several resistors of various sizes between about 10 ohm and 100 ohm and use whatever value gives you best fan speed vs noise... I think you'll need to get resistors rated at 2w but probably lower ratings are also ok.

    For example: http://eu.mouser.com/Passive-Compone...z0z819Z1z0x6fr


    ps. and a simple tutorial: http://www.hardwaresecrets.com/article/79
    Last edited by mariush; 08-13-2011 at 10:47 PM.

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    If it's a PWM fan I suspect a resistor won't help. They're designed to be run @ constant voltage & duty cycle modulated by the PWM signal (which is a square wave). Fan controller is a better solution, and I fail to see how suggesting that is trolling.

    If it's a 3-pin fan you can just do the 7v or 5v mods, just google "7v fan mod" or "5v fan mod" respectively. No resistors required...

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    Cutting the PWM wire should produce a three wire fan. (it can be spliced by your friend if needed) Or removing the PWM "pin" from the plug.
    If you have old parts to take connectors from your friend could solder wires from a molex plug to a fan male plug in the lower voltage configuration
    My feeling is counting the cost and time running around a new quieter fan is probably a simpler choice, a socket 775 stock cooler someone has laying around?

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