Hello,

I have now tested both the GTX580 and the GTX680 with Octane. I can confirm that the GTX580 is faster (consistently, about 15% with Octane 1.0 RC3), despite the GTX680 having 3 times the number of CUDA cores. Within a series (5xx or 6xx), speed should be proportional to the number of CUDA cores.

I would still recommend the 6xx series now, due to the texture number. The attached image (a really small scene) uses 44 texture map slots already, and the reason I could not load Stonemason's "Streets of Asia" with my old card was also due to too many textures (and not due to RAM size, as I thought initially).

Best regards,

   Michael