MSI B550-A PRO User Manual - Page 29
PCI_E1~4: PCIe Expansion Slots, M.2 slots and PCIe slots combination table
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PCI_E1~4: PCIe Expansion Slots PCI_E1: PCIe 3.0/ 4.0 x16 (CPU) PCI_E2: PCIe 3.0 x1 (PCH) PCI_E3: PCIe 3.0 x4 (PCH) PCI_E4: PCIe 3.0 x1 (PCH) ⚠⚠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 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. ∙∙When installing PCIe SSD in M.2_2, PCI_E3 slot will be unavailable. M.2 slots and PCIe slots combination table Slot Combination M2_1 (CPU) M2_2 (PCH) PCIe/SATA PCIe x4 ─ PCI_E1 (CPU) ✓ ✓ PCI_E2 (PCH) ✓ ✓ PCI_E3 (PCH) ─ ✓ PCI_E4 (PCH) ✓ ✓ (SATA: M.2 SATA SSD, PCIe: M.2 PCIe SSD, ✓: available, ─: unavailable) Overview of Components 29