I uploaded a scene and tried to test it out. It kept on failing when trying to process the scene. I deleted some objects from the scene and the file size of my orbx went from 290 to 130 GB and then it processed fine.
The scene loads fine in my 780ti witch has 3 GB of VRAM (this is at 18432x1536 resolution) .
If I remember correctly, the cards used on ORC have 4 GB of VRAM, so I dont know if that is what caused the problem.