Given your needs I wouldn't imagine you being in any way disappointed with the ATI (or AMD I should say) card. I would be leaning towards ATI, mainly for the lower power consumption at the performance though, I personally stay away from big power hogs whenever possible (some people aren't that bothered).
CUDA allows the GPU to be used for more generic computations, not just graphics; it's generally used in high-performance computing applications, though it's also used for PhysX. If you don't care about either, you won't miss out.
Thanks for describing CUDA for me there mate! I have been confused since before. I thought CUDA was the number of cores that the GPU has. Still I don't need CUDA for generic computation and PhysX. I don't care about how particles are with PhysX. So should I go with ATI?
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