SOYO SY-P4I845PEISA - Manual (Page 20)

Hardware Installation SY-P4I845PEISA/GEISA
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4. Then close the socket handle to secure the CPU in place.
Remember to connect the CPU Cooling Fan to the appropriate
power connector on the Motherboard. The fan is a key
component that will ensure system stability. The fan prevents
overheating, therefore prolonging the life of your CPU.
CPU Fan Installation
Your Socket 478 processor kit comes with a cooling fan. Mount the fan on
the processor according to the instructions provided by the manufacturer.
The fan is a key component that will ensure system stability. The fan
prevents overheating, therefore prolonging the life of your CPU.
Note: Remember to connect the fan to the appropriate power source.