EVGA 160-LF-E659 - Manual (Page 22)

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Expansion Slots
PCI Express x16/x8/x4 Slots
These PCI Express slots are reserved for Graphic Cards and PCI Express x1
and x4 devices. The design of this motherboard supports multiple Graphic Card
technology.
When installing a PCI Express Graphic 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.