I can only second Slicker's and F$'s rants about nVidia; their cards/chips are much more expensive than AMD's and at the same time a lot slower when it comes to brute force TFLOPS. Add to that their crappy policy with OpenCL: a standard they actively took part in its design in the Khronos Group IIRC, in contrast to AMD, and then crippled on their own hardware due to crappy marketing reasons.
Well, I guess they argue someone has to keep buying their totally overpriced Quadro and Tesla product lines running CUDA...

And they still claim to be the world market leader in visual computing professional equipment, somehow I find that hard to believe... But then again it could be the traditionalists in businesses and research using GPU computing equipment for construction/design never buy anything else than NVidia equipment.

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