EVGA nForce 3 250 User Manual page 24

SYSFAN1, SYSFAN2, CPUFAN: FAN Headers (3-pin)
These connectors support cooling fans of 350mA (4.2 Watts) or less,
depending on the fan manufacturer, the wire and plug may be different.
The red wire should be positive, while the black should be ground.
Connect the fan's plug to the board taking into consideration the polarity
of connector.
CDIN: CD Audio-In Headers (4-pin)
CDIN are the connectors for CD-Audio Input signal. Please connect it
to CD-ROM CD-Audio output connector.
1
CPUFAN
3
1
SYSFAN
3
1
SYSFAN
CDIN
4
CD Audio-In Headers
24
3
1