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I tried to run a render test using Arnold GPU on a machine here at work and I kept receiving the error "OptiX was not found." I opened Maya and checked in the Arnold System tab and noticed that there were no GPUs listed.
We have 4 GPUs in the workstation but they're all in TCC mode. Is Arnold currently unable to use GPUs in TCC mode? That would be a shame. We've seen it improve render times by as much as 10% on other GPU renderers.
I think it should work in TCC mode. What model quadros are these? What version of Arnold is being reported?