MSI X299-A PRO

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Overview of Components
PCI_E1~5: PCIe Expansion Slots
Please refer to the table below for the PCIe lanes of the CPU.
Multiple graphics cards installation recommendation
PCI_E1 PCI_E1
PCI_E3
PCI_E3
PCI_E5
PCI_E1
CPU 48-lane CPU 44-lane CPU 28-lane CPU 16-lane CPU
PCI_E1 PCIe x16 PCIe x16 PCIe x16 PCIe x8 PCIe x8
PCI_E2 PCIe x4 PCIe x4 PCIe x4 PCIe x4 PCIe x4
PCI_E3 PCIe x16 PCIe x16 PCIe x8 PCIe x8 PCIe x4
PCI_E4 PCIe x1 PCIe x1 PCIe x1 PCIe x1 PCIe x1
PCI_E5 PCIe x8 PCIe x8 PCIe x4 Unavailable PCIe x4
Note: 28-lane & 16-lane CPU
don’t support 3-WAY SLI.