Power Header For Active Cooling Solutions; Table 44. Reference Solution Fan Power Header Pinout; Table 45. Boxed Processor Fan Power Header Pinout - Intel Pentium 4 Design Manual

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10.1.2

Power Header for Active Cooling Solutions

The Intel reference-design heatsink includes an integrated fan. The recommended connector for
the active cooling solution is a Walden*/Molex 22-01-3037, AMP* 643815-3 or equivalent. The
integrated fan requires the system board to supply a minimum of 740 mA at 12 V for proper
operation. The fan connector pinout is described in Table 44.

Table 44. Reference Solution Fan Power Header Pinout

Pin Number
The Intel boxed processor heatsink includes an integrated fan. The recommended connector for the
active cooling solution is a Walden*/Molex* 22-23-2037, AMP* 640456-3 or equivalent. The
integrated fan requires the system board to supply a minimum of 740mA at 12V for proper
operation. The fan connector pinout is described in Table 45.

Table 45. Boxed Processor Fan Power Header Pinout

Pin Number
The fan heatsink outputs a SENSE signal, which is an open-collector output that pulses at a rate of
two pulses per fan revolution. The system board requires a pull-up resistor to provide the
appropriate Voh level to match the fan speed monitor. Use of the SENSE signal is optional. If the
SENSE signal is not used, pin 3 should be tied to GND.
For more information on boxed processor requirements, refer to the processor datasheet.
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Intel Pentium 4 Processor / Intel
Signal
1 Ground
2 +12 V
3 No Connect
Signal
1 Ground
2 +12 V
3 SENSE
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850 Chipset Family Platform Design Guide
Additional Design Considerations
195