EVGA NFORCE 680I SLI 122-CK-NF68-XX - Manual (Page 76)

Hardware Installation
25
Fan Connections
There are two fan connections, the system fan and the CPU fan. The fan speed
can be detected and viewed in the
PC Health Status section of the CMOS Setup.
Both fans are automatically turned off after the system enters S3, S4 and S5
mode.
Note that the CPU fan cable can be
either a 3-pin or a 4-pin connector.
Connect a 3-pin connector to pins 1, 2,
and 3 on the motherboard connector.
CPU Fan Connector
4 3 2 1
GND SENSE
PWR CONTROL
The nForce SPP and MCP have a passive
heat sink that draws heat from the chips.
You can install a fan onto the SPP heat
sink that helps to cool the chips. Hook the
fan over the SPP heat sink. Use the two
screws to secure the fan to the SPP. Plug
the cable into the fan connector.
Secure fan assembly using two screws
SPP Connector
3 2 1
GND
+12V
SENSE