Installing and Configuring the EVGA nForce 680i SLI Motherboard
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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.
From Power Supply
Install the SLI connector
onto the two outer cards.