EVGA X79 - PCI-E X1 Slots; PCI-E X16;X8 Slots

EVGA X79 Motherboard
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PCI-E x1 Slots
There are PCI-E x1 slots that are designed to accommodate less bandwidth-
intensive cards, such as a sound or network card.
PCI-E x16/x8 Slots
These PCI-E slots are reserved for Graphics Cards and PCI-E x1, x4, x8 and
x16 devices. The design of this motherboard supports multiple Graphics Card
technologies such as SLI or CrossFireX.
When installing a PCI-E Graphics 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.