Intel PentiumD 950 HH80553PG0964M User Manual

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In addition, Type I TMA must be used with Type I chassis only and Type II TMA with 

Type II chassis only. Type I TMA will not fit in a Type II chassis due to the height 

difference. In the event a Type II TMA is installed in a Type I chassis, the gasket on the 

chassis will not seal against the Type II TMA and poor acoustic performance will occur 

as a result.

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 

do fan noise levels. These set points are represented in 

 

. 

The 

internal chassis temperature should be kept below 35.5ºC. 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