541 View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

541

Intel® Pentium® 4 Processors Supporting Hyper-Threading Technology

Intel 

Boxed Processor Specifications

Table 7-2. Fan Heatsink Power and Signal Specifications

Boxed Processor Fan

Heatsink Set Point (ºC)

Boxed Processor Fan Speed

Notes

X ≤ 30

When the internal chassis temperature is below or equal to this set point,

the fan operates at its lowest speed. Recommended maximum internal

1

chassis temperature for nominal operating environment.

Y = 34

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 ≥ 38

When the internal chassis temperature is above or equal to this set point,

the fan operates at its highest speed.

-

NOTES:

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

Table 7-1) 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 temperature

diode (Tdiode). 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

Intel® Pentium® 4 Processor on 90 nm Process in the 775-Land Package Thermal Design Guide.

§

96

Datasheet

Share Link: