Multi GPU

Development Rendering
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Hello have a question regarding multi GPU in Unreal can you use multi Gpu for path tracing rendering?
Do you have to have a SLI mode or can you also use two different graphics cards in the system?
RTX 3090 was still SLI capable but RTX 4090 is no longer, so can you use two RTX 4090 for path tracing renderings and does this double the speed?
What about lumen and DLSS?
Would be great if someone could give me some information!
Thanks a lot!

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i don’t think so. there’s no capability to share data across devices. sli doesn’t provide that gpu ↔ gpu interconnect and nvlink was abandoned, cause it did not provide enough bandwidth. one solution would be tiled rendering. or some form of hack to use ndisplay with multiple devices. the other is alternate frame rendering. not sure how to set up either of those. i reckon it’s certainly possible with some coding experience.