Intel Pentium 4 User Manual

Additional Design Considerations
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Intel
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Pentium
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4 Processor / Intel
®
850 Chipset Family Platform Design Guide 195
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 Signal
1 Ground
2 +12 V
3 No Connect
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 Signal
1 Ground
2 +12 V
3 SENSE
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.

Intel Pentium 4 Specifications

General

Brand	Intel
Model	Pentium 4
Category	Computer Hardware
Language	English