SOYO SY-P4I845PEISA - Manual (Page 33)

Hardware Installation SY-P4I845PEISA/GEISA
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2. Cooling Fan Installation
(1) CPU Cooling Fan (CPUFAN1, CPUFAN2)
After you have seated the CPU properly on the processor, attach the 3-pin
fan cable to the CPUFAN connector on the Motherboard.
To avoid damage to the system, install according to the following pin
assignment:
CPU Cooling Fan
(CPUFAN1,CPUFAN2)
CPUFAN Pin Assignment
CPUFAN1
SENSOR +12V GND
3 1 2
CPUFAN2
GND +12V NC
3 1 2