SOYO SY-P4I845PE User Manual page 30

Hardware Installation
(2) Chassis Cooling Fan (CHAFAN1, CHAFAN2)
Some chassis also feature a cooling fan. This Motherboard features a
CHAFAN connector to provide 12V power to the chassis fan. Connect the
cable from the chassis fan to the CHAFAN 3-pin connector. Install
according to the following pin assignment:
Note: CPU cooling fan must be installed to prevent CPU from
overheating and ensure system stability. Chassis cooling fan is
optional, depending on whether there is cooling fan in your chassis.
Classis Cooling Fan
(CHAFAN1, CHAFAN2)
CHAFAN Pin Assignment
CHAFAN1
1 2 3
GND
12V
CHAFAN2
1
3 2
NC
12V
26
SY-P4I845PE
SENSOR
GND