Replacing stock P4 fan

  • Thread starter Thread starter Malloy
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Malloy

What method do the fans in stock Pentium 4 HSFs use to adjust their speed? I
assume that their RPMs increase with temperature but I've never seen a
temperature sensor on them. Are there third party fans available that
adjust their speed the same way? Thanks..
 
Malloy said:
What method do the fans in stock Pentium 4 HSFs use to adjust their speed? I
assume that their RPMs increase with temperature but I've never seen a
temperature sensor on them. Are there third party fans available that
adjust their speed the same way? Thanks..
Click to expand...

Many are attached to the motherboard with a 3-pin connector, and the
sensor under the chip tells the motherboard how fast to spin the fan.

There are also cooling accessories you can get to plug your fan into so
you have more control.
 
Many are attached to the motherboard with a 3-pin connector, and the
Thanks for your reply. So could I use a 3 pin Panaflo fan for this purpose?
Would its RPM be controlled by the mobo's sensor as well?

Here is a link to such a fan ...

http://www.newegg.com/app/ViewProductDesc.asp?description=35-180-041&depa=0
Click to expand...

I'm not sure. If it's a case fan it might have a different CFM than a
CPU fan. Maybe you can try a heatsink/fan combo? They are sold with
ratings (like "up to AMD 3200+"), making it less likely to goof up :)
 
Malloy, if the fan you get is plugged into the connector on the motherboard
as opposed to a power supply jack, it will be controlled by the motherboard
sensor. The fan you specify though is a case fan, which isn't going to mount
to the CPU cooler. I suggest you try to buy a replacement CPU cooler
kit,complete with fan
 
Malloy said:
What method do the fans in stock Pentium 4 HSFs use to adjust their speed? I
assume that their RPMs increase with temperature but I've never seen a
temperature sensor on them. Are there third party fans available that
adjust their speed the same way? Thanks..
Click to expand...

The stock P4 fan has a built in temperature sensor that adjust speed based
on case temp (inlet to fan). Minimum speed below 30C and maximum above 38C.
 
Not with a stock P4 fan and using motherboard control would interfere with
it's built in speed control.
Thanks for your reply. So could I use a 3 pin Panaflo fan for this purpose?
Would its RPM be controlled by the mobo's sensor as well?
Click to expand...

No, unless you have some third party software to do it, such as speedfan.
 
Thanks for your reply. So could I use a 3 pin Panaflo fan for this purpose?
Would its RPM be controlled by the mobo's sensor as well?
Click to expand...
Yes. The speed is controlled by the voltage sent to the fan by the
motherboard.
 
Conor said:
ROFLMAO. The bullshit in this NG is unbelievable.
Click to expand...

You took the words right out of my mouth.

Intel® Pentium® 4 Processor on 90 nm Process Datasheet

2.80 GHz - 3.40 GHz Frequencies Supporting Hyper-Threading
Technology1 for All Frequencies with 800 MHz Front Side Bus

Document Number: 300561-002

7.3.2 Variable Speed Fan
The boxed processor fan operates at different speeds over a short range of
internal chassis temperatures. This allows the processor fan to operate at
a lower speed and noise level, while internal chassis temperatures are low.
If the internal chassis temperature increases beyond a lower set point, the
fan speed will rise linearly with the internal temperature until the higher
set point is reached. At that point, the fan speed is at its maximum. As
fan speed increases, so does fan noise levels. Systems should be designed
to provide adequate air around the boxed processor fan heatsink that
remains below the lower set point. These set points, represented in Figure
22 and Table 32, can vary by a few degrees from fan heatsink to fan
heatsink. The internal chassis temperature should be kept below 38 ºC.
Meeting the processor's temperature specification (see Chapter 5) is the
responsibility of the system integrator.

Note: The motherboard must supply a constant +12 V to the processor's power
header to ensure proper operation of the variable speed fan for the boxed
processor (refer to Table 31 for the specific requirements).
 
Conor said:
ROFLMAO. Of course it does....
Click to expand...

Intel® Pentium® 4 Processor on 90 nm Process Datasheet

2.80 GHz - 3.40 GHz Frequencies Supporting Hyper-Threading
Technology1 for All Frequencies with 800 MHz Front Side Bus

Document Number: 300561-002

7.3.2 Variable Speed Fan
The boxed processor fan operates at different speeds over a short range of
internal chassis temperatures. This allows the processor fan to operate at
a lower speed and noise level, while internal chassis temperatures are low.
If the internal chassis temperature increases beyond a lower set point, the
fan speed will rise linearly with the internal temperature until the higher
set point is reached. At that point, the fan speed is at its maximum. As
fan speed increases, so does fan noise levels. Systems should be designed
to provide adequate air around the boxed processor fan heatsink that
remains below the lower set point. These set points, represented in Figure
22 and Table 32, can vary by a few degrees from fan heatsink to fan
heatsink. The internal chassis temperature should be kept below 38 ºC.
Meeting the processor's temperature specification (see Chapter 5) is the
responsibility of the system integrator.
 
Conor said:
ROFLMAO. Of course it does....
Click to expand...
Try this Conor. Take a standard Intel fan and DON'T connect it to the MB
header. Connect to a constant 12v source. Then, tell me why it still changes
speeds.............


Ed
 
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