🚀 go-pugleaf

On Fri, 21 Sep 2001 23:21:57 GMT, "Karl Dieter" <nospam@mydomain.com>
wrote:

>I'd appreciate other people's thoughts on this as I can't seem to locate any
>web pages on the subject...
>
>I have built a PC using the following:
>
>1) Intel D850GB
>2) 2 x Nidec 120x120x25mm fans
>3) ...and other things
>
>The problem (if it is a problem), is that the rear fan spins fine, to pull
>out the hot air from inside the case.  The fan at the front never spins to
>draw in cool air.  Now I know why, it's because the sensor for the front fan
>is so low down in the case, it doesn't detect any heat and doesn't spin.
>Where-as, the rear fan has it's sensor at the top of the motherboard, where
>the processor & RAM are, and there-fore spins all the time.
>
>Now is it normal to have this setup?  I basically have the rear fan spinning
>all the time, and the front fan never spinning, as it's sensor doesn't
>detect any heat.  I would have thought to have a constant in-flow of cool
>air would be a good thing.

Sure it would. Of course, you actually *do* have an in-flow of cool
air at the front, but it's all being *driven* from the one fan at the
back. Having some extra push on the way in would help keep the density
of air in the PC up (allowing it to absorb more heat, i.e. provide
more cooling, while it's there), and speed up the airflow ('cos the
rear fan won't be fighting such a big pressure differential). But for
this, you need either a "dumb" fan with no temperature sensor
controlling it, or one that actually senses the temperatures of the
sensitive components in the system, and turns on the extra cooling
when it really is required.

I have to say, though, just one of those big fans is probably plenty,
unless you have a seriously hot/over-crowded system. And don't forget
the noise an extra fan makes... I'd be inclined to go for a more
modest (i.e., slower, smaller and quieter) "dumb" fan at the front, or
just make do without.

There are some really good low-noise models at www.quietpc.com .


>Anyway, thoughts and comments appreciated.  The system works perfectly, I'm
>just wondering why I have a front case fan that appears to be never used.
>
>Regards.
>
Is the sensor part of the fan, or on the MOBO, or a seperate plug-in,
or what? Can you override it, e.g. by plugging in the fan differently,
or by a BIOS/Jumper setting?


	Paul B.  =:o}

(Discard unreality before replying...)