Maybe upgrading is pointless… - PCI-E Gen 4 vs Gen 3

May well be as it is working fine in PCIE x16 slot three off the chipset and PCI E x16 slot one is CPU may be the odd chance CPU is not seated

PCI Express

pcie x16 slot 4-slot Customer Rating Top-Rated · 5 · 4 & Up · 3 & Up · 2 & Up PNY

pcie 2 slot Computer bus interfaces provided through the connector are PCI Express x4 , Serial ATA , and USB (a single logical port for each of