Intel i7-960 AT80601002727AA User Manual

Datasheet 

95

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 

internal chassis temperatures. This allows the processor fan to operate at a lower 

speed and noise level, while internal chassis temperatures are low. If 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 cooler then lower set point. These set points, 

represented in 

, can vary by a few degrees from fan 

heatsink to fan heatsink. The internal chassis temperature should be kept below 

40 ºC. Meeting the processor temperature specification (see 

) is the 

responsibility of the system integrator.

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 

 for the specific requirements.

°

X ≤ 30

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.

1

1. Set point variance is approximately ± 1 °C from fan heatsink to fan heatsink.

Z ≥ 40

When the internal chassis temperature is above or equal to this set point, 

the fan operates at its highest speed. Recommended maximum internal 

chassis temperature for worst-case operating environment.

-

Lowest Noise Level

Internal Chassis Temperature (Degrees C)

X

Z

Increasing Fan
Speed & Noise

Higher Set Point

Highest Noise Level