Pci_E1~4: Pcie Expansion Slots - MSI Z97 GAMING 3 Manuel D'instructions

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.
Important
The PCIe x1 slots (PCI_E1, PCI_E3) will be unavailable when installing an expansion
card in the PCI_E4 slot.
PCI1~3: PCI 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.
PCIe 2.0 x8 Slot
PCIe 2.0 x1 Slot
PCI Slot
En-16
PCIe 3.0 x16 Slot