MSI B550 GAMING GEN3 AM4 ATX Motherboard - Manual (Page 29)

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T1
PCI_E1~6: PCIe Expansion Slots
PCI_E1 : PCIe 3.0 x16 (From CPU)
PCI_E4 : PCIe 3.0 x4 (From B550 chipset)
PCI_E2 : PCIe 2.0 x1 (From B550 chipset)
PCI_E5 : PCIe 2.0 x1 (From B550 chipset)
PCI_E3 : PCIe 2.0 x1 (From B550 chipset)
PCI_E6 : PCIe 2.0 x1 (From B550 chipset)
⚠
Important
∙ If you install a large and heavy graphics card, you need to use a tool such as MSI
Graphics Card Bolster to support its weight to prevent deformation of the slot.
∙ For a single PCIe x16 expansion card installation with optimum performance, using
the PCI_E1 slot is recommended.
∙ 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.
∙ PCI_E4 will run 2.0 x1 speed when any one of PCI_E2, PCI_E3, and PCI_E5 slots was
be installed.
PCIe bandwidth of PCIe slots
Slot Single 2-Way
PCI_E1 (CPU) @ 3.0 x16 @ 3.0 x16
PCI_E2 (PCH) 2.0 x1 2.0 x1 Empty Empty —
PCI_E3 (PCH) 2.0 x1 Empty 2.0 x1 Empty —
PCI_E4 (PCH) 2.0 x1 2.0 x1 2.0 x1 2.0 x1 @3.0 x4
PCI_E5 (PCH) 2.0 x1 Empty Empty 2.0 x1 —
PCI_E6 (PCH) 2.0 x1 2.0x1
(─: unavailable, @: graphics card)