PCIe Gen 4 vs Gen 3 Slots, Speeds

PCI Express Base Specification 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 pci e slot Steps to determine the PCI Express version is supported by your motherboard

pcie training error slot 1 Non-hot-plug PCI riser board slot definitions Primary PCIe 3-slot riser cage* PCIe 2-slot x16 riser cage 1