> Date: Fri, 22 Aug 2008 14:36:25 -0500
> From: [EMAIL PROTECTED]
> To: [email protected]
> Subject: Re: [Prime] cooling issues
>
> Brian Last-Name wrote:
>> A fan is just a device that creates a pressure differential. If you
>
> A fan is a device which creates a certain air flow. 

Yes, you are right.   My bad.

>
>> More fans in one direction, after a certain point, will not make a
>> difference. The best bet is to have one fan blowing in and one
>> blowing out. Instead of pressurizing/depressurizing the case, you
>> are now inducing airflow, which is the only thing that will get your
>> heat sinks cooler.
>
> Having two identical fans, one blowing in and one blowing out,
> will not increase the air flow, except as noted above.
>
> Mike

Everything you have said, Mike, is right, but in my experience it doesn't 
translate well to a computer case.   A computer case has a lot of stuff between 
it and the fan, including wires and cards.   Many times, fans just end up 
creating a vortex of air through the fan and the nearby vent holes, without 
necessarily crossing the hot processor.  By putting the fans in series, 
espically one in the front and one in the back, actually creates a flow through 
the case and across the heat sinks.   It worked for me, and thats why I put it 
all under "lessons learned".

Here is a good site explaining a lot about fans: 
http://www.comairrotron.com/engineering_notes_02.asp

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