Fan Heatsink Power And Signal Specifications - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - THERMAL MECHANICAL SPECIFICATIONS AND DESIGN GUIDELINES 01-2011 Specifications

Boxed Processor Specifications
Table 11-2. Fan Heatsink Power and Signal Specifications
Boxed Processor Fan
Heatsink Set Point
(
X  30
Y = 35
Z  40
Note:
1. Set point variance is approximately ± 1 C from fan heatsink to fan heatsink.
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
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.
Thermal/Mechanical Specifications and Design Guidelines
º C)
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.
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.
When the internal chassis temperature is above or equal to this set point,
the fan operates at its highest speed.
Table
Boxed Processor Fan Speed
11-1) and remote thermal diode measurement
§
Notes
1
101