PCIe x16 GPU card into a PCIe x8 slot?

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Hey guys, I just have a quick question According to the internet, x16 and x8 are just pcie slot lengths Like the Pcie would be the

But i didnt unterstand if a PCIe ×8 gpu can be slowed down if its in an PCIe slot Can slot For example, you can insert a x8 card into a x16 slot The x8 card won't completely fill the slot, but it will work at x8 speeds if up-plugging is

50 lions slot machine online hdx card in PCI-Express x8 card slot Pro Tools HDX & HD Native Systems Delock Riser Card PCI Express x8 to x8 with flexible cable 30 cm Item No : 85766 88029 Delock Riser Card PCI Express x8 male to x8 slot with cable