I'm running 10.11.6 with the 3,1 Definition and I'm wondering if it would be possible to boot a custom Sys Def from the Unibeast flash drive. I looked up my system components to see what my computer would be classified as, and I came across the iMac 27-inch 5K (15,1.) The reason why I want to boot with the 15,1 sys def from the Unibeast flash drive is because I have seen a lot of people having a black screen upon boot with a NVIDIA graphics card. Is this issue specifically for NVIDIA cards...
System Definitions
System Definitions