PCIe x16 card in x16 physical x8 electrical slot?

PCIe x8 card that supports 2 independant NVMe drives pcie 8x slot In the case of the OP's MOBO, the blue PCI-e slot on the top is assigned x16 The two little slots under it are x1 each The black slot is x4, pcie slot length PCI Express PCI-E PCIe 8X to 16X Female Slot Adapter Converter Riser Card for Graphics Card, You can get more details about PCI Express PCI-E PCIe 8X to 16X

pcie slot qrelease The adapter card converts the 8X socket on the motherboard to the 16X connector, which greatly improves the application of the motherboard No driver, no jumper