Re: How fast should CPU processor cooling fans run?

From: Robert Heller (heller_at_deepsoft.com)
Date: 08/29/04 

Date: Sun, 29 Aug 2004 02:26:37 +0200

  Jean-David Beyer <jdbeyer@exit109.com>,
  In a message on Sat, 28 Aug 2004 15:31:42 -0400, wrote :

JB> Paul Lutus wrote:
JB> > Jean-David Beyer wrote:
JB> >
JB> >
JB> >>My machine has two 3.06GHz Xeon processors in it. Each of these processors
JB> >>has an Intel-supplied heat sink: a huge slab of copper with lots of fins
JB> >>weighing in at about one pound. It is necessary for the bolts that mount
JB> >>the processor retaining mechanism to go right through the mother board
JB> >>into the chassis to support the heat sinks. Each heat sink is enclosed in
JB> >>a "Processor Wind Tunnel" also supplied by Intel to ensure that the
JB> >>cooling air goes through the heat sink, cooling it, and not around it.
JB> >>Each 1.5" thick 60mm temperature-controlled fan is also supplied by Intel
JB> >>for this purpose.
JB> >>
JB> >>Right now, my machine is pretty loud. Probably because:
JB> >>
JB> >>CPU0 fan: 9121 RPM (min = 3000 RPM, div = 2)
JB> >>CPU1 fan: 11250 RPM (min = 3000 RPM, div = 2)
JB> >>System: +52C (limit = +45C, hysteresis = +40C) sensor = thermistor
JB> >>CPU0: +55.5C (limit = +60C, hysteresis = +55C) sensor = thermistor
JB> >>CPU1: +54.5C (limit = +60C, hysteresis = +55C) sensor = thermistor
JB> >>
JB> >>_Just how fast is it permissable for these fans to go?_ It sort-of
JB> >>screams. My room temperature is about 80F at the moment, but I am
JB> >>concerned what will happen when it goes up to 95F which is not unheard of
JB> >>in this neck of the sand dunes of New Jersey.
JB> >
JB> >
JB> > Maybe the fans are doing exactly what they were designed to do, given the
JB> > room temperature. If the fans are much quieter at 3 AM with the room's
JB> > windows open, chances are they are working as they should.
JB>
JB> In this weather, the room's windows are always open: one open at the
JB> bottom with a double intake fan blowing outside air in, and the other at
JB> the top to let the hotter air out. It is undoubetly quiter in the cool of
JB> the night, when the nights are sometimes cool.

Here is a totally random idea: There must be an appliance store
somewhere nearby -- it should be possible to buy yourself a room AC
unit.

Through window unit seem to go for about $125 each (5KBTU) (Froogle
search). Might be worth it. At $300/each (also Froogle search), those
Xeon processors are worth spending a few bucks on to keep cool. You
seem to have a window available...

                                     \/
Robert Heller ||InterNet: heller@cs.umass.edu
http://vis-www.cs.umass.edu/~heller || heller@deepsoft.com
http://www.deepsoft.com /\FidoNet: 1:321/153

                                                                        

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