Re: How many amps does an average case fan

Discussion in 'DIY Computers' started by Jaimie Vandenbergh, Jan 14, 2008.

  1. On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
    <> wrote:

    >How many amps does an average case fan use/need/consume/whatever?
    >
    >I need to replace the fan on my PSU. The original one was rated at
    >0.33A.


    80mm chunky PC fans tend to be in the .1 to .4 amp range, usually less
    than your .33A though. But the PSU should have gobs of power spare,
    that's its job...

    Cheers - Jaimie
    --
    Beer has food value, but food has no beer value.
     
    Jaimie Vandenbergh, Jan 14, 2008
    #1
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  2. Bitstring <>,
    from the wonderful person Jaimie Vandenbergh
    <> said
    >On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
    ><> wrote:
    >
    >>How many amps does an average case fan use/need/consume/whatever?
    >>
    >>I need to replace the fan on my PSU. The original one was rated at
    >>0.33A.

    >
    >80mm chunky PC fans tend to be in the .1 to .4 amp range, usually less
    >than your .33A though. But the PSU should have gobs of power spare,
    >that's its job...


    The problem isn't the PSU, the problem is powering the case fans through
    motherboard headers, which often have a pretty low safe limit. If they
    are powered direct from a molex connector then it isn't going to be a
    problem.

    --
    GSV Three Minds in a Can
    10,414 Km walked. 2,032 Km PROWs surveyed. 36.9% complete.
     
    GSV Three Minds in a Can, Jan 14, 2008
    #2
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  3. On Mon, 14 Jan 2008 10:26:46 +0000, GSV Three Minds in a Can
    <> wrote:

    >Bitstring <>,
    >from the wonderful person Jaimie Vandenbergh
    ><> said
    >>On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
    >><> wrote:
    >>
    >>>How many amps does an average case fan use/need/consume/whatever?
    >>>
    >>>I need to replace the fan on my PSU. The original one was rated at
    >>>0.33A.

    >>
    >>80mm chunky PC fans tend to be in the .1 to .4 amp range, usually less
    >>than your .33A though. But the PSU should have gobs of power spare,
    >>that's its job...

    >
    >The problem isn't the PSU, the problem is powering the case fans through
    >motherboard headers, which often have a pretty low safe limit. If they
    >are powered direct from a molex connector then it isn't going to be a
    >problem.


    Bornfree says it's on the PSU, which I take to mean in the PSU, so
    it'll almost certainly be a chop and solder installation.

    Cheers - Jaimie
    --
    ....most SF writers are small blokes; they spent a lot of time grubbing
    around on the floor for old SF mags, not stretching up to the top shelf
    for pornography... As an aside, Douglas Adams is quite tall.
    - Terry Pratchett
     
    Jaimie Vandenbergh, Jan 14, 2008
    #3
  4. On Mon, 14 Jan 2008 06:35:22 -0800 (PST), bornfree
    <> wrote:

    >On 14 Jan, 04:44, Jaimie Vandenbergh <>
    >wrote:
    >> On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
    >>
    >> <> wrote:
    >> >How many amps does an average case fan use/need/consume/whatever?

    >>
    >> >I need to replace the fan on my PSU. The original one was rated at
    >> >0.33A.

    >>
    >> 80mm chunky PC fans tend to be in the .1 to .4 amp range, usually less
    >> than your .33A though. But the PSU should have gobs of power spare,
    >> that's its job...

    >
    >You would have thought so. However I put a 800rpm Scythe 0.1A ish fan
    >in my Seasonic PSU, the the fan won't start unless I nudge it.


    800rpm sounds a bit specialist - built in temperature sensor maybe,
    that was poorly adjusted at the factory? 0.1A current draw is
    definitely too little to bother a PSU, so it's a fan or voltage
    problem.

    Cheers - Jaimie
    --
    "And I hope my Sam's behaved hisself and given satisfaction?"
    "Perfect satisfaction, Mr. Gamgee," said Frodo.
     
    Jaimie Vandenbergh, Jan 14, 2008
    #4
  5. In <>
    bornfree <> wrote:

    > You would have thought so. However I put a 800rpm Scythe 0.1A ish fan
    > in my Seasonic PSU, the the fan won't start unless I nudge it.


    I expect the PSU doesn't run the fan at full speed unless it gets hot
    and by default it doesn't provide enough voltage for that fan to start.

    --
    TH * http://www.realh.co.uk
     
    Tony Houghton, Jan 14, 2008
    #5
  6. On Mon, 14 Jan 2008 16:45:58 +0000, Tony Houghton <>
    wrote:

    >In <>
    >bornfree <> wrote:
    >
    >> You would have thought so. However I put a 800rpm Scythe 0.1A ish fan
    >> in my Seasonic PSU, the the fan won't start unless I nudge it.

    >
    >I expect the PSU doesn't run the fan at full speed unless it gets hot
    >and by default it doesn't provide enough voltage for that fan to start.


    Good thought, Seasonic's are sensible like that.

    A quick voltmeter check across the (erk) splices would verify.

    Cheers - Jaimie
    --
    "How to Stop the System for Recovery Purposes"
    - chapter heading, Sun Microsystems System Administration Guide
     
    Jaimie Vandenbergh, Jan 14, 2008
    #6
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