SOYO SY-P4I845PEISA - Manual (Page 34)

Hardware Installation SY-P4I845PEISA/GEISA
29
(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.
+12V
SENSOR
GND
3
1
2
CHAFAN1/CHAFAN2
Chassis Cooling Fan
(CHAFAN1,CHAFAN2)
CHAFAN Pin Assignment