ASUS Z97-A last PCIE x16 slot not working?

PCI-Express slot speed and utilization? pcie 2 slot In general, a larger PCI Express card or slot supports greater performance, assuming the two cards or slots you're comparing support the same pciex1_1 slot While every PCIe card is backward compatible, if you put a PCIe SSD card into a slot, the performance can only achieve rates 2

pcie x16 expansion slot Go in to BIOS and Set PCIE to AUTO or Gen 4 it may be getting hung up on the gen 5 PCIE slot So boot to bios from second slot