View Full Version : OpenCL/Cuda (psst) what matters with a graphic card?

Andreas Galster
05-03-2011, 11:10 AM
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.kitguru.net/components/graphic-cards/zardon/msi-r6970-lightning-twin-frozr-iii-review-18-phase-pwm/)
http://www.newegg.com/Product/Product.a ... 6814127582 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814127582)

05-03-2011, 05:18 PM
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.