Intel E5400 AT80571PG0682ML Data Sheet

Datasheet

97

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 

 and 

, 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 

) 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.

Lower Set Point

Lowest Noise Level

Internal Chassis Temperature (Degrees C)

X

Y

Z

Increasing Fan
Speed & Noise

Higher Set Point

Highest Noise Level