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Lower fan speed could make cpu cooler?

 
 
Matt
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      12-28-2003, 12:06 AM
Hi,

I have amd xp 2600 oced to 2300 mhz (200x11.5)....i use volcano 9 to cool
it...always blowing max at 5200 rpms...i lowered it to about 3500 and it
seems to run at the same temp and sometimes lower...is this normal?


 
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Ed
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      12-28-2003, 01:21 AM
On Sun, 28 Dec 2003 00:06:08 GMT, "Matt" <(E-Mail Removed)> wrote:

>Hi,
>
>I have amd xp 2600 oced to 2300 mhz (200x11.5)....i use volcano 9 to cool
>it...always blowing max at 5200 rpms...i lowered it to about 3500 and it
>seems to run at the same temp and sometimes lower...is this normal?
>


With a case that has the correct airflow going through it and a decent
heatsink on the CPU you really shouldn't need a fast/loud fan on the CPU
heatsink. I run a barton @ 2315MHz and I set my CPU fan to spin at 2500
to 2700 RPM, the CPU die temp is still 20C below spec at full loads (in
the summer) and has never crashed since I built it 7+ months ago.

Ed

 
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Joe
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      12-28-2003, 01:36 PM
How is the fan speed adjusted?
"Ed" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Sun, 28 Dec 2003 00:06:08 GMT, "Matt" <(E-Mail Removed)> wrote:
>
> >Hi,
> >
> >I have amd xp 2600 oced to 2300 mhz (200x11.5)....i use volcano 9 to cool
> >it...always blowing max at 5200 rpms...i lowered it to about 3500 and it
> >seems to run at the same temp and sometimes lower...is this normal?
> >

>
> With a case that has the correct airflow going through it and a decent
> heatsink on the CPU you really shouldn't need a fast/loud fan on the CPU
> heatsink. I run a barton @ 2315MHz and I set my CPU fan to spin at 2500
> to 2700 RPM, the CPU die temp is still 20C below spec at full loads (in
> the summer) and has never crashed since I built it 7+ months ago.
>
> Ed
>



 
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NewUser001
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      12-28-2003, 03:39 PM
using a rheostat
"Joe" <(E-Mail Removed)> wrote in message
news:bsmm7l$e31ed$(E-Mail Removed)-berlin.de...
> How is the fan speed adjusted?
> "Ed" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > On Sun, 28 Dec 2003 00:06:08 GMT, "Matt" <(E-Mail Removed)> wrote:
> >
> > >Hi,
> > >
> > >I have amd xp 2600 oced to 2300 mhz (200x11.5)....i use volcano 9 to

cool
> > >it...always blowing max at 5200 rpms...i lowered it to about 3500 and

it
> > >seems to run at the same temp and sometimes lower...is this normal?
> > >

> >
> > With a case that has the correct airflow going through it and a decent
> > heatsink on the CPU you really shouldn't need a fast/loud fan on the CPU
> > heatsink. I run a barton @ 2315MHz and I set my CPU fan to spin at 2500
> > to 2700 RPM, the CPU die temp is still 20C below spec at full loads (in
> > the summer) and has never crashed since I built it 7+ months ago.
> >
> > Ed
> >

>
>



 
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Ed
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      12-28-2003, 07:30 PM
On Sun, 28 Dec 2003 08:36:01 -0500, "Joe" <(E-Mail Removed)> wrote:

>How is the fan speed adjusted?


I have one of those adjustable CPU fans (same one the Aero7+ uses) on a
Vantec Aeroflow HS. Antec full tower case with just a CoolerMaster 92mm
fan in the bottom (no rear 80mm) with a home made adjustable V regulator
circuit connected to that (2500 RPM max) and 3 thermal sensor 80mm case
fans (1000-2700 RPM/2-rear/1-front).

The only unpleasant noise in my system is the 2nd HDD, it's an old WD
40GB and makes a whinny sound, I'm looking to replace that soon.

Cheers,
Ed

 
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GTD
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      12-29-2003, 05:40 AM
It seems possible, that at higher speeds the fan is "cavitating".
Cavitation is when, due to the specific design of the fan / blades,
the airflow spins with the blades as opposed to flowing 'through' the
fan at higher speeds. I've never heard of a fan doing this, but it is
fairly common on the propellors of ships. I've witnessed boats
actually go faster at half to three-quarters throttle than they could
wide open. The centrifugal force on the mass of the spinning air water
causes it to go outward, and if there is a kort nozzel (kind of like a
fan shroud), the water goes 'around' it. I'm not sure if this is what
you are experiencing, but it does sound firmilliar. Just my $.02


On Sun, 28 Dec 2003 00:06:08 GMT, "Matt" <(E-Mail Removed)> wrote:

>Hi,
>
>I have amd xp 2600 oced to 2300 mhz (200x11.5)....i use volcano 9 to cool
>it...always blowing max at 5200 rpms...i lowered it to about 3500 and it
>seems to run at the same temp and sometimes lower...is this normal?
>




You should start drinking prune juice and KY jelly cocktails right now,
that will make things a lot smoother.
-Felatio Love
 
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