Intel Processor fan

R

Roby

tom418 said:
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
 
R

Roby

tom418 said:
Thanks. I'll check it out, while I still have my hearing left ;)

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

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
 

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