GTX 970 And R9 280X in one build?

Hey guys,

I’m a dual boot user who separates work from free time. I have two individual graphics cards in my system, a r9 280x and a GTX 970. The 970 is supposed to be for windows, where the R9 280X is for MacOS. On Sierra I was able to just use nv_disable=1 and MacOS wouldn’t see the 970. Now on High Sierra, whenever plugging both cards in and trying to boot from clover, all I get is a black screen after clover’s verbose mode and no cursor whatsoever.

Can anybody help me?