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