Intel Core 2 Quad Q8200 BX80570Q8200 User Manual

Datasheet

101

If the boxed processor fan heatsink 4-pin connector is connected to a 4-pin 

motherboard header and the motherboard is designed with a fan speed controller with 

PWM output (CONTROL see 

) and remote thermal diode measurement 

capability the boxed processor will operate as follows:

As processor power has increased the required thermal solutions have generated 

increasingly more noise. Intel has added an option to the boxed processor that allows 

system integrators to have a quieter system in the most common usage.

The 4th wire PWM solution provides better control over chassis acoustics. This is 

achieved by more accurate measurement of processor die temperature through the 

processor's Digital Thermal Sensors (DTS) and PECI. Fan RPM is modulated through the 

use of an ASIC located on the motherboard that sends out a PWM control signal to the 

4th pin of the connector labeled as CONTROL. The fan speed is based on actual 

processor temperature instead of internal ambient chassis temperatures.

If the new 4-pin active fan heat sink solution is connected to an older 3-pin baseboard 

processor fan header it will default back to a thermistor controlled mode, allowing 

compatibility with existing 3-pin baseboard designs. Under thermistor controlled mode, 

the fan RPM is automatically varied based on the Tinlet temperature measured by a 

thermistor located at the fan inlet.

For more details on specific motherboard requirements for 4-wire based fan speed 

control see the appropriate Thermal and Mechanical Design Guidelines (See 

This section documents the mechanical specifications of the Boxed Intel

®

 Core™2 

Extreme processor QX9650. The boxed processor will be shipped with an unattached 

fan heatsink. 

shows a mechanical representation of the boxed processor.

Clearance is required around the fan heatsink to ensure unimpeded airflow for proper 

cooling. The physical space requirements and dimensions for the boxed processor with 

assembled fan heatsink are shown in 

 

(top view), and 

 

(side view). 

The airspace requirements for the boxed processor fan heatsink must also be 

incorporated into new baseboard and system designs. Airspace requirements are 

shown in 

and 

. Note that some figures have centerlines shown 

(marked with alphabetic designations) to clarify relative dimensioning.

The Boxed Intel

®

 Core™2 Extreme processor QX9650 cooling solution violates the 

boxed processor keep out zones. This is done intentionally, and with the understanding 

that Extreme Edition systems will be integrated into larger capacity chassis.