Just a little word about nvidia cards: I have a GeForce RTX 2080Ti and it works like a charm, in both modes:

And it faster in OptiX mode. BUT: i used to have an old setting that was still checked: "Separate process" render. Uncheck this if you intend to use your GPU... Don't know if it's a bug but when it's checked, it uses the GPU as well, but at max 6-7% of its speed... And for what I understand, I'm not sure it's useful with a 64bits OS...

𝒫𝒽𝓎𝓁

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