X6800 Datasheet, PDF (108/122 Pages) Intel Corporation – Core2 Extreme Processor

Boxed Processor Specifications
Figure 39. Boxed Processor Fan Heatsink 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 39.
Fan Heatsink Power and Signal Specifications
Boxed Processor Fan
Heatsink Set Point (°C)
Boxed Processor Fan Speed
Notes
X ≤ 30
Y = 35
Z ≥ 38
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
1
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.
-
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 Table 38) and remote thermal diode measurement
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 temperature diode (T-diode). 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.
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Datasheet