BX80547PG3200FSL8Q6 Datasheet, PDF (104/105 Pages) Intel Corporation – Intel® Pentium® 4 Processor 6xxΔ Sequence and Intel® Pentium® 4 Processor Extreme Edition

Balanced Technology Extended (BTX) Type I Boxed Processor Specifications
8.3.2 Variable Speed Fan
If the boxed processor fan heatsink 4-pin connector is connected to a 3-pin motherboard header, it
will operate as follows:
The boxed processor fan will operate at different speeds over a short range of temperatures
based on a thermistor located in the fan hub area. This allows the boxed processor fan to
operate at a lower speed and noise level while thermistor temperatures are low. If the
thermistor senses a temperatures increase beyond a lower set point, the fan speed will rise
linearly with the 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. These set points are
represented in Figure 8-6 and Table 8-2. 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 8-1) for the specific
requirements.
Figure 8-6. Boxed Processor TMA Set Points
Increasing Fan
Speed & Noise
Higher Set Point
Highest Noise Level
Lower Set Point
Lowest Noise Level
X
Y
Z
Internal Chassis Temperature (Degrees C)
Table 8-2. Balanced Technology Extended (BTX) Type I Boxed Processor TMA Set Points for
3-wire Operation
Boxed Processor
TMA Set Point (ºC)
Boxed Processor Fan Speed
X ≤ 23
When the internal chassis temperature is below or equal to this set point,
the fan operates at its lowest speed. Recommended maximum internal
chassis temperature for nominal operating environment.
Y = 29
When the internal chassis temperature is at this point, the fan operates
between its lowest and highest speeds. Recommended maximum
internal chassis temperature for worst-case operating environment.
Z ≥ 35
When the internal chassis temperature is above or equal to this set point,
the fan operates at its highest speed.
NOTES:
1. Set point variance is approximately ±1 °C from fan heatsink to fan heatsink.
Notes
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Datasheet