MSI CSM-H61M-P32/W8 - Manual (Page 25)

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MS-7788
PCie (Peripheral Component interconnect express) Slot
the PCie slot supports the PCie interface expansion card.
PCie x6 slot
PCie x slot
PCi (Peripheral Component interconnect) Slot
the PCi slot supports LAN card, SCSi card, uSB card, and other add-on cards
that comply with PCi specifications.
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.
PCi interrupt request routing
irQ, or interrupt request lines, are hardware lines over which devices can send
interrupt requests to the processor. the PCi irQ pins are typically connected to
the PCi bus pins as followed:
order
Slot
 2 3 4
PCi  iNt A# iNt B# iNt C# iNt d#