MSI MEG X399 CREATION - PCIe Expansion Slots and Graphics Cards

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Overview of Components
BAT1
PCI_E1~5: PCIe Expansion Slots
PCI_E1: PCIe 3.0 x16
PCI_E2: PCIe 2.0 x1
PCI_E3: PCIe 3.0 x8
PCI_E4: PCIe 3.0 x16
PCI_E5: PCIe 3.0 x8
Multiple graphics cards recommendation (Except 2990WX processor)
Graphics Card Single 2-Way 3-Way
PCI_E1
PCI_E3
PCI_E4
PCI_E5
PCI_E4*
PCI_E1**
Multiple graphics cards recommendation (For 2990WX processor only)
Graphics Card Single 2-Way 3-Way
PCI_E1 (CPU Die 1)
PCI_E2 (Promontory) PCIe x1 slot
PCI_E3 (CPU Die 1)
PCI_E4 (CPU Die 0)
PCI_E5 (CPU Die 0)
* Single card installation for 2990WX processor only.
** Single card installation except 2990WX processor.