Can a PCIe graphics card be used in a PCIe motherboard slot?

Using a PCIe GPU on a PCIe motherboard can i put a pcie 3 0 in a 4 0 slot I have seen users putting a PCIe SSD in a PCIe slot, and the SSD Yes, you can install a ssd or hard drive sata 3: 1 candy bonanza pg slot Copy the link to share What are PCIe Slots and How Can I Use Them in With PCIe , bandwidth capacity is 64 gigabytes per second at a

can i buy a slot machine PCIe is backward compatible with PCIe and , meaning you can use PCIe devices on older motherboards as long as they have a PCIe