EVGA 121-BL-E756 - Manual (Page 29)

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PCI Slots
The PCI slot supports many expansion cards such as a LAN card, USB card,
SCSI card and other cards that comply with PCI specifications. When installing
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bracket to the chassis back panel with the screw used to hold the blank cover.
PCI Express x1 Slots
There is one PCI Express x1 slot that is designed to accommodate PCIe 1x
cards, such as a Killer Xeno Network Card or Sound Card. The x1 slot provides
250 MB/sec bandwidth.
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
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with the screw used to hold the blank cover.