Why PCI Express backplanes are so expensiveunpopular?

website pci 4 in pci 3 slot Computer bus interfaces provided through the connector are PCI Express x4 , Serial ATA , and USB (a single logical port for each of pcie 4 m2 in pcie 3 slot After a quick Google search, I found this article which explains that: a PCIe x16 slot can theoretically hit approximately 32 gigabytes

pci 4 in pci 3 slot As with previous generations, the standard simply doubles the speed that the PCIe slot runs at It now provides about 2GBs per lane  For example, the latest NVIDIA RTX 3080 PCIe gaming GPU should work fine in PCIe slot and not get a significant performance hit because,  Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express

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