QX6000 datasheet(94/98 Pages) INTEL

94 / 98 page

Boxed Processor Specifications

Datasheet

7.3.2

Fan Speed Control Operation (Intel® Core™2 Extreme

processors 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 32). 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 appropriate

Thermal and Mechanical Design Guidelines (see Section 1.2).

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 32 for specific

requirements.

7.3.3

Fan Speed Control Operation (Intel® Core™2 Quad

processor)

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 Figure 30 and Table 33, 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 32 for the specific requirements.

QX6000 Datasheet(PDF) 94 Page - Intel Corporation