MSI A78M-E45 - Manual (Page 26)

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PCI_E~E3: PCIe Expansion Slots
The PCIe slot supports the PCIe interface expansion card.
PCIe x Slot
PCIe 3.0 x6 Slot
PCIe 2.0 x6 Slot
PCI: PCI Expansion Slot
The PCI slot supports the PCI interface expansion card..
PCI Slot
Important
When adding or removing expansion cards, always turn off the power supply and
unplug the power supply power cable from the power outlet. Read the expansion
card’s documentation to check for any necessary additional hardware or software
changes.