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Thread: OpenCL/Cuda (psst) what matters with a graphic card?

  1. #1

    OpenCL/Cuda (psst) what matters with a graphic card?

    I need to decide between two graphic cards at the moment. One card has 2GB Ram (ATI), the other has about 1,3GB (nVidia). I want to use it mainly for interactive pathtracing rendering with OpenCL. Now I am wondering if the performance of the 570 GTX is going to be slower than the performance of the 6970. In general the performance of the 570 GTX is a little bit higher, but what about OpenCL? Will I benefit a lot from mor memory? Unfortunately 99,9% of all graphic card reviews do not cover OpenCL performance. Which card would be more suitable for my needs?

    http://www.kitguru.net/components/graph ... phase-pwm/
    http://www.newegg.com/Product/Product.a ... 6814127582

  2. #2
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    Re: OpenCL/Cuda (psst) what matters with a graphic card?

    I can't comment on which GPU will be better for this task but look at the card with the most memory bandwidth and largest caches. Path tracing on real-world scenarios is heavily bandwidth bound due to its stochastic nature.
    Disclaimer: Employee of Qualcomm Canada. Any opinions expressed here are personal and do not necessarily reflect the views of my employer. LinkedIn profile.

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