Yup, I got my statement a little wrong there. Nvidia cards that can use CUDA are;
"GeForce 8, 9, & 200-series GPUs with a minimum of 256MB of local graphics memory"
Also, there are Nvidia Tesla and Quadro's listed. See the whole list here;

http://www.nvidia.com/object/cuda_learn_products.html

As far as using CUDA to harness the Video Cards multiple cores for rendering 3D scenes...just give it some time, it will happen.

I would just love to help convince DAZ to put somebody on it, toot sweet.  ;o}

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