PCI Slot Installed Backwards??? Am I Crazy?

The following table shows PCIe slot compatibility Table 1 PCIe slot compatibility 1x slot, 4x slot, 8x slot, 16x slot 1x adapter, Supported, Supported

Typically they will all be PCI Express, but for a graphics card you need a PCI Express x16 slot 1 lane 'big' and wired for the 1 lane These

pcie training error slot 1 slots, but larger size adapters do not fit in smaller slots Table 1 shows PCIe slot compatibility Table 1 PCIe slot compatibility 1x slot, 4x slot, 8x slot

pcie 4 nvme in pcie 3 slot 1 lspci -vmm shows PhySlot for some of the devices You are on your own determining if the slots are numbered from 0 or 1 :)