Just wanted to say thanks again to @bliblubli for all of his hard work and evrything that he is teaching us in his building Blender course.
I’ve got initial support for cpu + Nvidia + AMD GPUs all at the same time in my custom build.
2x intel xeon 2670s, 2x gtx 4gig 970s, 1x 32gig radeom pro duo rendering at the same time. 
Needs a ton of testing as I made the mistake of writing it over night so I was awake for over a day and a half and there should obviously be some mistakes in my auto scrambling distance but I’ve already corrected it.
Defualt bmw scene. Check out the settings in both pics.
Cranked up the samples super high for this render just to see what my build can do.
And a quick 5 minute video of my custom build doing the coolest thing ever.
You’ll see the auto scrambling distance glitch but I’ve corrected it since screen capping the video.