Ray-Tracing on Secondary GPU?

[SkyHound0202]

I remember PhysX can be run on a secondary Nvidia GPU using its CUDA cores. Now that DirectX Ray-Tracing (DXR) is available on non-RTX cards using their CUDA cores, could it be hypothetically possible for Nvidia to enable offloading DXR computation to a secondary GPU?

 

(I am aware of the bandwidth limit of PCIe 3.0 x8 as a potential bottleneck, hence "hypothetically")

[TechyBen]

NVidia would never support that. As 2 1080tis would be cheaper than a 2080/ti and outperform it (theoretically if you had an entire card for FPS and an entire card for ray casting)

[Jurrunio]

maybe? Surely not relatable to PhysX. PhysX is using GPU's power to calculate physics instead of CPU, itself is not directly related to rendering. RT on the other hand is. If RT can be split to work on 2 cards simultaneously, then we will be splitting off other parts of the rendering process but that didnt happen for all these years. Either it's super hard to code for or there's just a ton of things that could cause bottleneck and latency.