Intel BX80569QX6850 Datasheet download pdf (Page 107)

Datasheet 107

Boxed Processor Specifications

7.3.2 Fan Speed Control Operation (Intel

Core2 Extreme

Processor X6800 Only)

The boxed processor fan heatsink is designed to operate continuously at full speed to

allow maximum user control over fan speed. The fan speed can be controlled by

hardware and software from the motherboard. This is accomplished by varying the duty

cycle of the Control signal on the 4th pin (see Table 39). The motherboard must have a

4-pin fan header and must be designed with a fan speed controller with PWM output

and Digital Thermometer measurement capabilities. For more information on specific

motherboard requirements for 4-wire based fan speed control, refer to the Intel

Pentium

D Processor, Intel

Pentium

Processor Extreme Edition, Intel

Pentium

Processor, Intel

Core™2 Duo Extreme Processor X6800 Thermal and Mechanical

Design Guidelines.

The Internal chassis temperature should be kept below 39 ºC. Meeting the processor's

temperature specification (see Chapter 5) 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 fan for the boxed processor. See Table 39 for specific

requirements.

7.3.3 Fan Speed Control Operation (Intel

Core2 Duo Desktop

Processor E6000 and E4000 Sequences Only)

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 than lower set point. These set points,

represented in Figure 39 and Table 39, 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.

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 39 for the specific requirements.

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