I have stoped my investigations with CUDA because…
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Maximum what i got is a ~25% of decleared perfomance (not only me, i think nobody got more) of GPU.
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With ATI Strem I got 97% of perfomance (~970 GFlops) without any problems on card that are not dedicated. It is more flexible and developer frendly.
Reason for that i think is nVidia GPU structure. It make no cense to use nVidia as GPU device.
Thans & best regards,
Dmitry