PCIe x16 Slots

What's the bandwidth and form factor for PCIe x1 x4 x8 and x16? pcie 1 slot pci-e on PCI Most systems should have at least one x1 card slot, unless this is something like mini ITX However many modern systems do pcie 40 gpu in 30 slot One of my colleagues asked me about “Bifurcation” when it came in a discussion about running multiple NVMe drives from a single PCIe slot

pcie slot bracket For example, an x1 slot can have only one transfer lane used by the x1 card inserted into the slot; x2, x4, x8, and x16 slots are also available