Hi @fredrikanderss
I haven't checked it out fully but there's most probably not anything you can to resolve the problem except perhaps invest in a more up to date motherboard.
It all has to do with the number of available PCIe lanes on the motherboard, the motherboard's chipset and the CPU specifications.
Here's a [https://www.cgdirector.com/guide-to-pcie-lanes/|link] that explains the correlation between them that may help..