What is a PCIe slot with an x4 slot and x16 connector?

PCIe x8 NIC in PCIe x16 slot pcie slot x16 Maybe you have a hair or something else blocking a contact in your PCIe slot Or a bent socket pin Or a defective motherboard Or a defective pcie slot qrelease AMD B550 Ultra Durable Motherboard with Digital VRM Solution, PCIe x16 Slot PCIe x16 slot with faster bandwidth and lower impedance 2 PCIe

pcie 30 x4 slot Verilux® NVME Adapter PCIe x16 with Gel Pad, NVME or AHCI SSD to PCIE Adapter Card for Key M 2230, 2242, 2260, 2280 Size SSD, Support PCIe x4 x8