CPU Fan!

[TrekerOnLine]

You probably have a speed controlled fan in the PC. The
more work it does, the hotter the CPU gets, the faster
the fan runs. If you know what Motherboard etc. you have
in the PC, or the OEM who built it, look at their site,
to see if this is the case.
Check out some to the hardware or overclocking sites, and
you'll understand the advantage you have!

>-----Original Message-----
>During normal operation my CPU fan noise slows and
speeds up as I do
>different operations, such as open a program or a
different website. I think
>this may be a power supply issue. I am running a 350
watt PS, to run 2 HDs,
>CDRW, ZIP drive, 4 extra case fans plus the CPU fan and
stock Case fan. Any
>help in this would be appreciated. Operation seems
normal except the fan
>noise slowing and speeding up instead of a steady sound.
Thanks
>JCW
>
>
>.
>

[CWatters]

"TrekerOnLine" > wrote in message
...
> You probably have a speed controlled fan in the PC. The
> more work it does, the hotter the CPU gets, the faster
> the fan runs.

Possibly, but it normally takes time for the heat to build up and he implies
that the sound changes quicker and more frequently than that (eg it changes
when he changes web pages).

[CWatters]

"TrekerOnLine" > wrote in message
...
> You probably have a speed controlled fan in the PC. The
> more work it does, the hotter the CPU gets, the faster
> the fan runs.

Possibly, but it normally takes time for the heat to build up and he implies
that the sound changes quicker and more frequently than that (eg it changes
when he changes web pages).

[JCW]

Just to elaborate. A good example of this problem is when I click to SEND a
post or message I can hear the fan speed up momentarily then slow down
again. Any ideas?
JCW
"CWatters" > wrote in message
...
>
> "TrekerOnLine" > wrote in message
> ...
> > You probably have a speed controlled fan in the PC. The
> > more work it does, the hotter the CPU gets, the faster
> > the fan runs.
>
> Possibly, but it normally takes time for the heat to build up and he
implies
> that the sound changes quicker and more frequently than that (eg it
changes
> when he changes web pages).
>
>

[JCW]

Just to elaborate. A good example of this problem is when I click to SEND a
post or message I can hear the fan speed up momentarily then slow down
again. Any ideas?
JCW
"CWatters" > wrote in message
...
>
> "TrekerOnLine" > wrote in message
> ...
> > You probably have a speed controlled fan in the PC. The
> > more work it does, the hotter the CPU gets, the faster
> > the fan runs.
>
> Possibly, but it normally takes time for the heat to build up and he
implies
> that the sound changes quicker and more frequently than that (eg it
changes
> when he changes web pages).
>
>

[Bill Martin]

> Possibly, but it normally takes time for the heat to build up and he implies
> that the sound changes quicker and more frequently than that (eg it changes
> when he changes web pages).

Given that the poster is talking about the CPU fan it's probably working as
designed. Some systems control CPU fan speed from the onboard CPU
temperature sensor which would respond pretty quickly to an increased load -
hundreds of milliseconds perhaps. Unlike more typical fan sensors which are
measuring the heat sink temperature.

Bill

[Bill Martin]

> Possibly, but it normally takes time for the heat to build up and he implies
> that the sound changes quicker and more frequently than that (eg it changes
> when he changes web pages).

Given that the poster is talking about the CPU fan it's probably working as
designed. Some systems control CPU fan speed from the onboard CPU
temperature sensor which would respond pretty quickly to an increased load -
hundreds of milliseconds perhaps. Unlike more typical fan sensors which are
measuring the heat sink temperature.

Bill