I have a particular hardware configuration.
Two Nvidia RTX2080Tis + 1 GTX1080Ti + 1 AMD Radeon Pro 580.
The display is connected to the AMD gpu to leave the Nvidia gpu vram completely free to work with Cuda compatible renderers
Unfortunately If I start D5 using the AMD gpu as main display output the D5 software doesn’t use any Nvidia gpu.
Don’t worry, this is a missing feature also for Twinmotion or UE.
Unity has this feature. In fact I can setup my Unity scene using my AMD gpu as main display output and baking the textures using the two Nvidia gpus.
Because I’m testing also Nvidia Omniverse I noticed that this program uses my AMD gpu to display realtime RTX render and it has also the possibility to use two RTX gpus.
I think this feature is doable also in D5.
Regards.