🚀 go-pugleaf

Tue, 25 Sep 2001 05:49:40 GMT, "Karl Dieter" <nospam@mydomain.com>
wrote:

>The sensor is on the MOBO.  Basically, the fan sends it's RPM to the MOBO,
>then to the SMSC controller.  The sensor is placed near the fan plug header,
>and the sensor controls the voltage that gets sent to the fan.  What is
>happening is the sensor for the front fan never gets hot enough to send any
>voltage to the fan.  Where-as the sensor for the rear fan, is at the top of
>the case where the heat is, and naturally, gets hot and kicks off the rear
>fan to exhaust the air.
>
>This is fine and I can see how it's meant to work, but it's pointless having
>a fan in the front when it rarely ever starts.  Most of the time, my system
>is using the rear fan to exhaust air.  I do have a couple of Panaflo fans
>(120x120x38mm) that plug directly into the PSU, they work tremendously, but
>they are loud.  I can't hear the TV 5-feet away with these things.
>
>So because of that, I opted for the current setup (Nidec 120x120x25mm),
>these fans plug directly into the MOBO.
>
>Bit annoying...
>
>~ K ~
>
>

Hi Karl.

If the system runs cool enough, enjoy it, there's no need to have that
front fan going, especially if it's sensor is correct, that the lower
case temps are fine.  Then again, the reason your front fan isn't
turning, could be that it's a 120mm... is that the size the
motherboard was engineered to control?  Possibly an 80mm would be
turning?

If you really want to use those panaflows, you could try them with the
ground connected to the PSU 5V (red) for a potential of 7V.  The
easiest way would be to move the fan's ground contact in the fan
connector, so it mates with the PSU connector 5V line.  Whether they
will start at 7V may depend on the specific model.

How loaded is this system?  It's very uncommon for a PC to need two
120mm fans.


Dave
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