EVGA 122-CK-NF68-XX manual From Power Supply

Installing and Configuring the EVGA nForce 680i SLI Motherboard

2.Connect the PCI Express supplementary power connectors from the system power supply to each of the graphic cards:

From Power Supply

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.

Install the SLI connector onto the two outer cards.

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