From the wiki over at https://en.wikipedia.org/wiki/CUDA
CUDA is a parallel computing platform and application programming interface (API) model created by Nvidia.[1] It allows software developers and software engineers to use a CUDA-enabled graphics processing unit (GPU) for general purpose processing
Basically you need an Nvidia graphics card.
AMD/ATI does their own thing that is like CUDA but not the same.
RC does only support CUDA for calculating stuff on the graphics card.
What are your actual hardware specs of the cpmputer you run RC on?