Fan Speed Control Operation (Intel Core2 Extreme Processor X6800 Only); Fan Speed Control Operation (Intel Core2 Duo Desktop Processor E6000 And E4000 Series Only); Core2 Duo Desktop; Boxed Processor Fan Heatsink Set Points - Intel CORE 2 DUO E4000 - DATASHEET 3-2008 Datasheet

Boxed Processor Specifications
7.3.2 Fan Speed Control Operation (Intel
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
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
Processor, Intel
Design Guidelines.
The Internal chassis temperature should be kept below 39 ºC. Meeting the processor's
temperature specification (see
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
requirements.
7.3.3 Fan Speed Control Operation (Intel
Processor E6000 and E4000 Series 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
to fan heatsink. The internal chassis temperature should be kept below 38 ºC.
Meeting the processor's temperature specification (see
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 38
Figure 38.

Boxed Processor Fan Heatsink Set Points

Datasheet
®
D Processor, Intel Pentium
®
Core™2 Duo Extreme Processor X6800 Thermal and Mechanical
Chapter
Figure 38 and
for the specific requirements.
Lower Set Point
Lowest Noise Level
Internal Chassis Temperature (Degrees C)
®
Table 38). The motherboard must have a
®
Processor Extreme Edition, Intel
5) is the responsibility of the system integrator.
®
Table 38, can vary by a few degrees from fan heatsink
Increasing Fan
Speed & Noise
X
Y
Core2 Extreme
®
Pentium
Table 38 for specific

Core2 Duo Desktop

Chapter 5) is the
Higher Set Point
Highest Noise Level
Z
®
®
4
105