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Boxed Processor Specifications

7.3.2

Variable Speed Fan

The boxed processor fan operates 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 below the lower set point. These set points, represented in Figure 7-8 and

Table 7-2, 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 Chapter 5) is the responsibility of the system integrator.

Note:

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 Table 7-1 for the specific

requirements).

Figure 7-8. Boxed Processor Fan Heatsink Set Points

Table 7-2. Boxed Processor Fan Heatsink Set Points

Boxed Processor Fan

Heatsink Set Point (ºC)

Boxed Processor Fan Speed

Notes

≤ 30 °C

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.

NOTES:

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

Y = 34 °C

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.

—

≥ 38 °C

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

the fan operates at its highest speed.

Lower Set Point

Lowest Noise Level

Internal Chassis Temperature (Degrees C)

Increasing Fan

Speed & Noise

Higher Set Point

Highest Noise Level

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