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[SOLVED] Re: How many amps does an average case fan

 
 
Jaimie Vandenbergh
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      Jan 14th, 08, 5:44 AM
On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
<(E-Mail Removed)> 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
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GSV Three Minds in a Can
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      Jan 14th, 08, 11:26 AM
Bitstring <(E-Mail Removed) ssile.org>,
from the wonderful person Jaimie Vandenbergh
<(E-Mail Removed)> said
>On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
><(E-Mail Removed)> 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.

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Jaimie Vandenbergh
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      Jan 14th, 08, 12:56 PM
On Mon, 14 Jan 2008 10:26:46 +0000, GSV Three Minds in a Can
<(E-Mail Removed)> wrote:

>Bitstring <(E-Mail Removed) ssile.org>,
>from the wonderful person Jaimie Vandenbergh
><(E-Mail Removed)> said
>>On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
>><(E-Mail Removed)> 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
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for pornography... As an aside, Douglas Adams is quite tall.
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Jaimie Vandenbergh
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      Jan 14th, 08, 4:24 PM
On Mon, 14 Jan 2008 06:35:22 -0800 (PST), bornfree
<(E-Mail Removed)> wrote:

>On 14 Jan, 04:44, Jaimie Vandenbergh <(E-Mail Removed)>
>wrote:
>> On Sat, 12 Jan 2008 16:54:51 -0800 (PST), bornfree
>>
>> <(E-Mail Removed)> 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
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Tony Houghton
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      Jan 14th, 08, 5:45 PM
In <(E-Mail Removed)>
bornfree <(E-Mail Removed)> 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.

--
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Jaimie Vandenbergh
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      Jan 14th, 08, 6:55 PM
On Mon, 14 Jan 2008 16:45:58 +0000, Tony Houghton <(E-Mail Removed)>
wrote:

>In <(E-Mail Removed)>
>bornfree <(E-Mail Removed)> 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
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