There’s never been any support for multiple GPUs in the editor, even for the humble SLI / Crossfire. And here we’re talking about 2 different GPUs and on top of that one is integrated and the other external GPU, and both on a platform that is not all that well supported in the first place.
Sadly, I do not see this happening.
I believe that the closest we’ve ever gotten to this was in older PhysX games where a single nVidia card could be dedicated to physics calculations. And it actually worked well.
I know Davinci Resolve is able to do
this, and it’s massively helpful.
I had a quick peek at:
But could not see any mentions regarding utilisation of 2 different GPUs (I skimmed it only). Do you, perhaps, know any sources that show how they pull it off?