MSI X299 RAIDER Quick Start Manual page 28

Multiple graphics cards installation recommendation
PCI_E1
PCI_E1
PCI_E3
PCI_E1
PCI_E3
PCI_E5
Important
If you install a large and heavy graphics card, you need to use a tool such as
MSI Gaming Series Graphics Card Bolster to support its weight and to prevent
deformation of the slot.
18
Overview of Components
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