MSI Z97 GAMING 9 AC Manual - Manual (Page 32)

Chapter 1
1-18 Getting Started
Expansion Slots
This motherboard contains numerous slots for expansion cards, such as discrete
graphics or audio cards.
PCI_E1~6: PCIe Expansion Slots
The PCIe slot supports the PCIe interface expansion card.
PCIe 2.0 x1 Slot
PCIe 3.0 x16 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.