My issue is dual booting Win10/Fedora27 (seperate drives) only comes when I add a second graphics card. When it is only my main card (980ti top slot x16) everything works fine but If I add a second (gtx750 lower slot x4 (and not hooked to a monitor) it gets initialized first and I can’t see the uefi/boot menu unless I also plug it into a monitor. Just a black screen until it chooses boot option 1: windows then it chooses the top slot card.
I’ve had no luck finding a setting that would default to using the top x16 slot for uefi/boot menu when another card is in the lower x4.
Also Fedora shits the bed when both cards are in but just slaying one boar at a time.