Intel Processor fan

[Guest]

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

The Processor fan on my P4 2.8C is running at 2690 rpm, with a 33(c)
processor temp. It's noisy!

Intel says that the speed should correlate with the temp , but mine is
~2690 regardless of temp.

http://support.intel.com/support/processors/pentium4/sb/CS-007999.htm#Heatsink

I have the fan plugged into the Mobo's 3-pin cpu fan connector. Anything
else needed (settings, etc) to get this fan to slow down? (MOBO is Intel
D865PERLL)

 

[roby]

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

tom418 wrote:

> The Processor fan on my P4 2.8C is running at 2690 rpm, with a 33(c)
> processor temp. It's noisy!
>
> Intel says that the speed should correlate with the temp , but mine is
> ~2690 regardless of temp.
>
>
http://support.intel.com/support/processors/pentium4/sb/CS-007999.htm#Heatsink
>
> I have the fan plugged into the Mobo's 3-pin cpu fan connector. Anything
> else needed (settings, etc) to get this fan to slow down? (MOBO is Intel
> D865PERLL)

I have the same m/b and processor and it was noisy here too! The m/b header
delivers 12v to the heatsink assembly regardless of temperature. The
heatsink is supposed to include a thermistor that reduces voltage to the
fan at low temperature. That's the theory.

I bought a manual speed control (several speeds, slide switch controlled)
made by Mad Dog Multimedia. The h/s fan connects to the control and the
control connects to the m/b cpu fan header (so that fan speed monitor still
works). It works for me.

Roby

 

[Guest]

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

Thanks. I'll check it out, while I still have my hearing left
"Roby" <roby@no-address.net> wrote in message
news:fuCdnVcA2PCUkb_cRVn-rg@adelphia.com...
> tom418 wrote:
>
> > The Processor fan on my P4 2.8C is running at 2690 rpm, with a 33(c)
> > processor temp. It's noisy!
> >
> > Intel says that the speed should correlate with the temp , but mine is
> > ~2690 regardless of temp.
> >
> >
>
http://support.intel.com/support/processors/pentium4/sb/CS-007999.htm#Heatsink
> >
> > I have the fan plugged into the Mobo's 3-pin cpu fan connector. Anything
> > else needed (settings, etc) to get this fan to slow down? (MOBO is
Intel
> > D865PERLL)
>
> I have the same m/b and processor and it was noisy here too! The m/b
header
> delivers 12v to the heatsink assembly regardless of temperature. The
> heatsink is supposed to include a thermistor that reduces voltage to the
> fan at low temperature. That's the theory.
>
> I bought a manual speed control (several speeds, slide switch controlled)
> made by Mad Dog Multimedia. The h/s fan connects to the control and the
> control connects to the m/b cpu fan header (so that fan speed monitor
still
> works). It works for me.
>
> Roby

 

[roby]

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

tom418 wrote:

> Thanks. I'll check it out, while I still have my hearing left
> "Roby" <roby@no-address.net> wrote in message
> news:fuCdnVcA2PCUkb_cRVn-rg@adelphia.com...
>> tom418 wrote:
>>
>> > The Processor fan on my P4 2.8C is running at 2690 rpm, with a 33(c)
>> > processor temp. It's noisy!
>> >
>> > Intel says that the speed should correlate with the temp , but mine is
>> > ~2690 regardless of temp.
>> >
>> >
>>
>
http://support.intel.com/support/processors/pentium4/sb/CS-007999.htm#Heatsink
>> >
>> > I have the fan plugged into the Mobo's 3-pin cpu fan connector.
>> > Anything
>> > else needed (settings, etc) to get this fan to slow down? (MOBO is
> Intel
>> > D865PERLL)
>>
>> I have the same m/b and processor and it was noisy here too! The m/b
> header
>> delivers 12v to the heatsink assembly regardless of temperature. The
>> heatsink is supposed to include a thermistor that reduces voltage to the
>> fan at low temperature. That's the theory.
>>
>> I bought a manual speed control (several speeds, slide switch controlled)
>> made by Mad Dog Multimedia. The h/s fan connects to the control and the
>> control connects to the m/b cpu fan header (so that fan speed monitor
> still
>> works). It works for me.
>>
>> Roby

FYI, here are my test results:

V         RPM        ma      ohms      watts
12       2670       145                               
11       2420       125         8       0.13
10       2230       115        17       0.22
 9       1985       105        29       0.32
 8       1730        95        42       0.38    
 7       1460        80        63       0.40   
 6       1155        75        80       0.45
 5        890        65       108       0.46
 4        680        55       145       0.44
 3      (stalls)

V = fan voltage, supplied by an external adjustable power supply.
RPM = fan speed as reported by monitor on m/b.
ma = current drawn by fan at voltage and speed listed.
ohms = series resistor needed to drop 12v to voltage listed (at the listed
load current).
watts = power dissipated in the resistor.

In my setup, the fan was nearly inaudible at 7 volts, but I need about
1800-1900 RPM to avoid excess temperature rise when really using the CPU
(e.g., compiling a new kernel).  Much less noise than at 2670RPM.

Roby