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Table 30.
Fan Heatsink Power and Signal Specifications
Boxed Processor
Fan Heatsink Set
Point (°C)
X ≤ 30
Y = 35
Z ≥ 38
NOTES:
1. Set point variance is approximately ± 1 °C from fan heatsink to fan heatsink.
If the boxed processor fan heatsink 4-pin connector is connected to a 4-pin
motherboard header and the motherboard is designed with a fan speed controller with
PWM output (CONTROL see
capability the boxed processor will operate as follows:
As processor power has increased the required thermal solutions have generated
increasingly more noise. Intel has added an option to the boxed processor that allows
system integrators to have a quieter system in the most common usage.
The 4th wire PWM solution provides better control over chassis acoustics. This is
achieved by more accurate measurement of processor die temperature through the
processor's Digital Thermal Sensors (DTS) and PECI. Fan RPM is modulated through the
use of an ASIC located on the motherboard that sends out a PWM control signal to the
4th pin of the connector labeled as CONTROL. The fan speed is based on actual
processor temperature instead of internal ambient chassis temperatures.
If the new 4-pin active fan heat sink solution is connected to an older 3-pin baseboard
processor fan header, it will default back to a thermistor controlled mode, allowing
compatibility with existing 3-pin baseboard designs. Under thermistor controlled mode,
the fan RPM is automatically varied based on the Tinlet temperature measured by a
thermistor located at the fan inlet.
For more details on specific motherboard requirements for 4-wire based fan speed
control, refer to the appropriate Thermal and Mechanical Design Guidelines (see
Section
1.2).
98
Boxed Processor Fan Speed
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.
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.
When the internal chassis temperature is above or equal to
this set point, the fan operates at its highest speed.
Table
29) and remote thermal diode measurement
§
Boxed Processor Specifications
Notes
1
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Datasheet
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