EVGA nForce 122-CK-NF68-XX - Manual (Page 161)

Installing and Configuring the EVGA nForce 680i SLI Motherboard
110
Enable NVIDIA SLI
At this point, you need to enable NVIDIA SLI. You can do this either by
clicking on the
SLI capable system balloon or by going to the NVIDIA
Control Panel.
To launch the NVIDIA Control Panel, select Start ¾ All Programs ¾ NVIDIA
Corporation ¾ NVIDIA Control Panel. Click on the 3D Settings icon .
Select
Set SLI configuration from under Performance .
Click Enable SLI technology (recommended) and click Apply.