MSI Z97 U3 PLUS 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_E1~4: PCIe Expansion Slots
The PCIe slot supports the PCIe interface expansion card.
PCIe 2.0 x1 Slot
PCIe 3.0 x16 Slot
PCIe 2.0 x16 Slot
PCI1~3: PCI Expansion Slots
The PCI slot supports additional LAN, SCSI, USB, 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.