MSI H81M-P32L Manual page 25

PCI_E~2: PCIe Expansion Slots
The PCIe slot supports the PCIe interface expansion card.
PCI~2: PCI Expansion Slots
The PCI slot supports the PCI 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.
PCIe x Slot
25
PCIe x6 Slot
PCI Slot