Intel Core 2 Extreme QX6850 BX80569QX6850 User Manual

119

NOTES:
1.

Set point variance is approximately ±1°C from Thermal Module Assembly to Thermal 
Module Assembly.

If the boxed processor TMA 4-pin connector is connected to a 4-pin motherboard 

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

(see CONTROL in 

) and remote thermal diode measurement capability, the 

boxed processor will operate as described in the following paragraphs.

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 4-wire PWM controlled fan in the TMA solution provides better control over chassis 

acoustics. It allows better granularity of fan speed and lowers overall fan speed than a 

voltage-controlled fan. Fan RPM is modulated through the use of an ASIC located on 

X ≤ 23

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.

1

Y = 29

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.

 Z ≥ 35.5

When the internal chassis temperature is above or equal to this 
set point, the fan operates at its highest speed.

1

Lower Set Point

Lowest Noise Level

Internal Chassis Temperature (Degrees C)

X

Y

Z

Increasing Fan
Speed & Noise

Higher Set Point

Highest Noise Level