XFX nForce 680i User Manual page 125

2. Connect the PCI Express supplementary power connectors from the
system power supply to each of the graphic cards:
3. Install the NVIDIA SLI connector across the two outer graphics cards as
shown below. Each SLI-Ready graphics card has an SLI finger on the upper
side of the card.
Installing Graphics Cards in an SLI Configuration
Install the SLI connector
onto the two outer cards.
From Power Supply
111