Hi, adp001,

Many thanks for taking the time and trouble to clarify that and for the link to what is supported by blender, worth a study...

What a dog's dinner...and yet Apple still sells an external GPU after dropping a couple of others from their store...

I just got a reply from PoserSoftware saying "CUDA or OPTIX" required and they have no idea about AMD...

In Snow Leopard, which is going back a few years, AMD boards showed up as an option in Poser 10, though god knows what drivers and open GL was involved.

Cheers,

Paul