Pci_E1~4: Pcie Expansion Slots - MSI X299 PRO Quick Start Manual

PCI_E1~4: PCIe Expansion Slots

Please refer to the table below for the PCIe lanes of the CPU.
Multiple graphics cards installation recommendation
PCI_E1
CPU
PCI_E1
PCI_E2
PCI_E3
PCI_E4
PCI_E1
PCI_E3
PCI_E4
48-lane CPU 44-lane CPU
PCIe x16 PCIe x16
PCIe x8 PCIe x4
PCIe x16 PCIe x16
PCIe x8 PCIe x8
PCI_E1
PCI_E3
Note: 28-lane CPU doesn't
support 3-WAY SLI.
28-lane CPU
PCIe x16
PCIe x4
PCIe x8
Unavailable
Overview of Components
17