Hello Maldon,
i have a GA- Z170X Designer Motherboard and use i5 6600K CPU. My new GPU is a Sapphire Nitro 580 8 GB Card. Devenition iMac 17.1.I use Mojave (18A371a)
I need a DSDT.aml. Here is my send.me file
Regards Lion_mounter
Send me Frankys-iMac.fritz.box.zip