Boxed Processor Specifications
7.2
Electrical Requirements
7.2.1
Fan Heatsink Power Supply
The boxed processor's fan heatsink requires a +12 V power supply. A fan power cable will be
shipped with the boxed processor to draw power from a power header on the baseboard. The power
cable connector and pinout are shown in Figure 7-4. Baseboards must provide a matched power
header to support the boxed processor. Table 7-1 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 2 pulses per fan revolution. A baseboard 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.
Note: The motherboard must supply a constant +12 V to the processor's power header to ensure proper
operation of the variable speed fan for the boxed processor.
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 7-7 shows the location of the fan power
connector relative to the processor socket. The baseboard power header should be positioned
within 4.33 inches from the center of the processor socket.
Figure 7-4. Boxed Processor Fan Heatsink Power Cable Connector Description
Pin
1
Signal
GND
Straight square pin, 3-pin terminal housing with
polarizing ribs and friction locking ramp.
2
3
+12V
0.100" pin pitch, 0.025" square pin width.
SENSE
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.
1
2
3
Table 7-1. Fan Heatsink Power and Signal Specifications
Description
Min
Typ
Max
Unit
Notes
+12 V: 12 volt fan power supply
IC: Fan current draw
10.2
—
12
—
13.8
740
V
—
—
mA
pulses per fan
revolution
1
SENSE: SENSE frequency
—
2
—
NOTES:
1. Baseboard should pull this pin up to 5 V with a resistor.
76
Datasheet
INTEL [ INTEL ]
