MSI H81M-P33 Mode D'emploi page 25

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PCI_E~2: PCIe Expansion Slots
The PCIe slot supports the PCIe interface expansion card.
PCIe 3.0 x6 Slot
PCIe 2.0 x 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.
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