EVGA NFORCE 780I SLI - Manual (Page 37)

780i 3-Way SLI Motherboard
EVGA
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PCI Express x1 Slot
There is one PCI Express x1 slot that is designed to accommodate less
bandwidth-intensive cards, such as a modem or LAN card. The x1 slot provides
250 MB/sec bandwidth.
PCI Express x16 Slots
These three PCI Express x16 slots are reserved for graphics or video cards. The
design of this motherboard supports three PCI-Express graphics cards using
NVIDIA’s SLI technology.
When installing a PCI Express x16 card, be sure the retention clip snaps and
locks the card into place. If the card is not seated properly, it could cause a
short across the pins. Secure the card’s metal bracket to the chassis back panel
with the screw used to hold the blank cover.
To configure for SLI, follow the instructions that come with the SLI kit (the kit
is purchased separately from the motherboard).