PCI Express Gen4 - 3 slot passive backplane

installing Gen4 NVME on a Gen3 Motherboard pcie gen 4 in gen 3 slot Zen 3 # of CPU PCIe® Native PCIe® Lanes : 24 , 20 Additional Usable PCIe Lanes from Motherboard X570 16x Gen 4 X470 2x Gen 3, 8x Gen pcie 2 slot Testing and installing a Gen4 NVME SSD on a Gen3 Motherboard This includes Unboxing

pcie slot length Find the computer manufacturer site or specification sheet for your motherboard and identify the supported PCIe generation on the website or specification sheet