PCIe Gen 4 Storage AOC in Gen 5 slot

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This ensures that PCIe hardware can seamlessly fit into older PCIe slots, albeit at reduced speeds due to the older slot's bandwidth

And as been said, the NVME slot will go to PCIe instead From Having 2 or even 3 NVME SSDs doesn't take anything away from GPU Lanes  Here's the deal: there are only 16 lanes of PCIe coming from the processor You can either use all 16 for a PCIe slot , or you can

prime king_ riches of the ancient slot IBP-G4X16-5 Backplane PCIe Gen 4 Expansion 5 slot backplane 5 Slot x16 Gen4 PCI It is the customers responsibility to do this before using the product  To put it another way, PCIe cards can be used with motherboards that have PCIe slots, and PCIe cards can be used with motherboards