Intel LGA775 - Manual (Page 20)

INSTALLATIONS
FAN1: CPU Fan Power Connector
Signal Name
1 Ground
2 +12V
3 Rotation detection
4 NC
FAN2: Chassis Fan Power Connector
FAN2 is a 3-pin header for the chassis fan. The fan must be a 12V fan.
Signal Name
1 Ground
2 +12V
3 Rotation detection
FAN3: System Fan Power Connector
FAN3 is a 3-pin header for a 12V fan.
Signal Name
1 Ground
2 +12V
3 Rotation detection
CN1: PS/2 Keyboard and PS/2 Mouse Connectors
PS/2 Mouse
PS/2 Keyboard
Below are the pin-out assignments of the connectors.
Signal Name Keyboard Mouse Signal Name
Keyboard data 1 1 Mouse data
N.C. 2 2 N.C.
GND 3 3 GND
5V 4 4 5V
Keyboard clock 5 5 Mouse clock
N.C. 6 6 N.C.
16 2801550 User’s Manual