3DS Max and Omniverse Create. Tree and city models from Turbosquid.
Here’s a video showing the insane render times live - NVIDIA Omniverse: Rendering at 4k on 2 RTX A6000's eats 18 billion triangles in seconds! - YouTube
It is worth mentioning that this demo is using two A6000 cards (approx $4,600 each.)
inspiring it is.