Intel Pentium 4 Processor in the 478-PinPackage at 1.40 GHz, 1.50 GHz, 1.60 GHz, 1.70 GHz, 1.80 GHz, 1.90 GHz, and 2GHz

Boxed Processor Specifications

90 Datasheet

Note: The processor retention mechanism based on the Intel reference design should be used,

to ensure compatibility with the heatsink attach clip assembly and the boxed processor

thermal solution. The heatsink attach clip assembly is latched to the retention tab features

at each corner of the retention mechanism.

8.3 Electrical Requirements

8.3.1 Fan Heatsink Power Supply

The boxed processor's fan heatsink requires a +12V power supply. A fan power cable will

be shipped with the boxed processor to draw power from a power header on the

motherboard. The power cable connector and pinout are shown in Figure 35.

Motherboards must provide a matched power header to support the boxed processor.

Tab l e 37 contains specifications for the input and output signals at the fan heatsink

connector. The fan heatsink outputs a SENSE signal, which is an open-collector output

that pulses at a rate of two pulses per fan revolution. A motherboard pull-up resistor

provides VOH to match the system board-mounted fan speed monitor requirements, if

applicable. Use of the SENSE signal is optional. If the SENSE signal is not used, pin 3 of

the connector should be tied to GND.

The power header on the baseboard must be positioned to allow the fan heatsink power

cable to reach it. The power header identification and location should be documented in

the platform documentation, or on the system board itself. Figure 36 shows the location of

the fan power connector relative to the processor socket. The motherboard power header

should be positioned within 4.33 inches from the center of the processor socket.

Figure 35. Boxed Processor Fan Heatsink Power Cable Connector Description

Pin Signal

Straight square pin, 3-pin terminal housing with

polarizing ribs and friction locking ramp.

0.100" pin pitch, 0.025" square pin width.

Waldom*/Molex* P/N 22-01-3037 or equivalent.

Match with straight pin, friction lock header on motherboard

Waldom/Molex P/N 22-23-2031, AMP* P/N 640456-3,

or equivalent.

GND

+12V

SENSE