Question - PCIE x8 into a PCIE x4

PCIe Vs PCIe : We Benchmarked Both ; Bandwidth: The PCIe connector boasts a maximum transfer rate of 64 GBs, marking a substantial

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pcie 30 in 40 slot In this video, I tested the PCIe gen 3 slots to see if there is any performance difference when

pcie 20 x16 slot But what about the fallback to PCIe , for example runs an older AMD or current Nvidia graphics card in such a slot? In order to remain really