Archived from groups: alt.comp.hardware.pc-homebuilt (
More info?)
Conor wrote:
> In article <1112buu6cgq0690@corp.supernews.com>, David Maynard says...
>
>
>>Not with a stock P4 fan and using motherboard control would interfere with
>>it's built in speed control.
>>
>
> ROFLMAO. The bullshit in this NG is unbelievable.
>
>
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).
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