MSI PRO B550-P GEN3 Manuel D'utilisation page 29

PCI_E1~6: PCIe Expansion Slots
⚠
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
PCI_E1 (CPU)
PCI_E2 (PCH) 2.0 x1
PCI_E3 (PCH) 2.0 x1
PCI_E4 (PCH) 2.0 x1
PCI_E5 (PCH) 2.0 x1
PCI_E6 (PCH)
(─: unavailable, @: graphics card)
PCI_E1: PCIe 3.0 x16 (From CPU)
PCI_E2: PCIe 2.0 x1 (From B550 chipset)
PCI_E3: PCIe 2.0 x1 (From B550 chipset)
PCI_E4: PCIe 3.0 x4 (From B550 chipset)
PCI_E5: PCIe 2.0 x1 (From B550 chipset)
PCI_E6: PCIe 2.0 x1 (From B550 chipset)
Single
@ 3.0 x16
2.0 x1 Empty
Empty 2.0 x1
2.0 x1 2.0 x1
Empty Empty
2.0 x1
27
2-Way
@ 3.0 x16
Empty —
Empty —
2.0 x1 @3.0 x4
2.0 x1 —
2.0x1