1 additional PCI-Express x1 slot is needed

It means that your graphics card or whatever card it is uses 4 PCI Express lanes out of your PCI Express slot A PCI Express slot has a

Cards are supposed to work down to x1 electrical For that Mellanox 10g card, running at pci-e means missing out on a few Gbps, you

pcie slot pinout  PCIe = x16 PCIe = x8 PCIe = x4 Where in that list do you supposed x1 falls? You can take the information and do with

pcie gen 4 in gen 3 slot 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