Bios Empty PCIe

I took my old graphics card (gtx 1080) to try in a new AMD build. When I tried to plug it back into my old (intel) computer, my computer doesn’t recognizes it. I looked at device manager and it’s not in display adapters. I tried with another graphics card (1660) from another machine and it’s the same thing. If I used the igpu, it does show video.

Any help would be appreciated.