Why PCI Express backplanes are so expensiveunpopular?

With options for 1x, 2x, 4x, 8x, and 16x slot configurations, PCI Express doubles the speed of PCI Express , increasing performance from

Steps to determine the PCI Express version is supported by your motherboard

pci e x16 slot PCI Express

pcie slot length For example, the latest NVIDIA RTX 3080 PCIe gaming GPU should work fine in PCIe slot and not get a significant performance hit because,