Swapping PCI bus cause hackintosh failed booting

Hey, I hope someone could help me out with this problem: I - please don't ask why - plugged my graphics card into a x8 PCI slot. Everything works fine, but when I try to switch to a x16 bus, my hackintosh denies booting. I have tried resetting my CMOS. But I can't even boot into -x or -f. It seems to hang on PCI configuration. Debugging the kexts also brings only rubbish on my screen. I've also tried to boot from my usb-install stick to reinstall the system. But this is also not possible with the card in the x16 bus. I think there is something like a cache where the PCI configuration is stored. But I can't locate it nor rebuild my kextcache. Any hints?

submitted by /u/cb_max
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