Fully-functional Sierra won't boot with my second GPU plugged in

So I setup a Clover-Sierra boot last summer, and have had no problems with it whatsoever.

Today I tried booting for the first time after adding a second 1080 Ti, and it gets stuck in some sort of loop during the OS boot. I'm aware that SLI doesn't work in Mac OS, all I really want is to be able to boot without having to unplug my second GPU.

Anyone know of kexts/args I should be adding to get it to boot?

• Aorus z370 Gaming 5
• 8700k
• TridentZ 32GB 3200MHz
• 2x 1080ti, original is EVGA FTW, second is reference card