Any adapters for a x16 PCIe slot split in multiple smaller ones?

pcie x16 expansion slot
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Figure shows a motherboard with two x1 PCIe, two x16 PCIe, and three PCI expansion slots Notice that the PCIe x16 slot has a retention

Card capacity and size Mac Pro has seven PCIe slots that accept many different types of PCIe cards: Slot 1: gen 4, up to x16

pcie 40 in pcie 30 slot PCIe links that use fewer lanes to use the same interface as PCIe links that use more lanes For example, a PCIe x8 card could plug into a PCIe x16 slot

pcie 3 slot Is it possible? I don't seem to find any PCIe expansion solution that expands a single PCIe3x16 slot to multiple such slots, that also supports