pcie x1 card in pcie x16 slot - Issues using the second M.2 SSD slot - HP Support Community - ... bm888 slot

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Lower PCIe lane cards can fit in higher slots; a PCIe x4 card and a PCIe x8 card can fit in a PCIe x16 slot, so there is no need to buy a PCIe x16 slot M.2 to PCIe expansion card if you don’t need all 4 M.2 slots.

3x PCIe x16 slots. PCI_E1 slot (From CPU). Supports PCIe 5.0 x16. PCI_E3 & PCI_E4 slots (From Z690 chipset). Supports PCIe 3.0 x4. 1x PCIe 3.0 x1 slot (From ...

The most common PCIe slot currently in use are PCIe x16 slots, PCIe x4 slots, and PCIe x1 slots as shown in the picture below.