What are the top uses of PCIe x1 Slots?

What are the top uses of PCIe x1 Slots? pcie slot cover PCIe Gen 4 pcie m2 slot PCIe Gen 4

pcie m2 slot Distinguished You should also be able to install a PCIe x1 in a long slot too Just be aware of which one as there is a slight possibility of

pcie 50 slot PCI Express IO Cards · PCB Hardware · Peripherals · Audio · Headphones This is a very thick and high quality chromed slot cover that will work on any case  PCIE slot standard spec I've added some sketches that cover the most important measurements for the slots, with one graphic depicting a top