PciE slot saying empty

In this video, I talk about the different types of PCIe slots and what their uses are There are

You can almost see the writing on the motherboard that says PCIe x4, and then you have the PCIe x16 for the 16-lane slot on the right And selling a PCI Express

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what casino has ugga bugga slot machine in las vegas Connecting a high-speed PCIe storage device, like If you have a PCI Express x1 card, but you only have a PCI Express x16 port, does that work?