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
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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

Architecture	x86
Core Count	1
Microarchitecture	NetBurst
Manufacturer	Intel
Core Names	Willamette, Northwood, Prescott, Cedar Mill
Virtualization Technology	No
Release Date	November 20, 2000
Clock Speed	1.3 GHz to 3.8 GHz
FSB Speed	400 MHz to 1066 MHz
Socket	Socket 423, Socket 478, LGA 775
Introduced	2000
Product Line	Pentium
Front Side Bus	400 MHz to 1066 MHz
Hyper-Threading	Yes (Prescott and later)
64-bit Support	Yes (Prescott and later)
Instruction Set	MMX, SSE, SSE2, SSE3
Discontinued	2008
Process Technology	180 nm, 130 nm, 90 nm, 65 nm
L2 Cache	256 KB, 512 KB, 1 MB, 2 MB
Lithography	180 nm, 130 nm, 90 nm, 65 nm
L1 Cache	8 KB