MSI AM1I - Manual (Page 13)

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PCI_E1: PCIe x16 Expansion Slot
The PCIe slot supports the PCIe interface expansion card.
MINI_PCI_E1: Mini-PCIe Expansion Slot
The Mini-PCIe slot supports the Mini-PCIe interface expansion card.
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.