Hi,

I admit, I have lots of differences in the two test rigs. The 580 is in an older machine running Windows XP 64 bit, while the GTX 680 is in a newer machine, running Windows 7, 64 bit. The NVidia drivers are both release 306, but the build numbers are different due to the different OSes.

If bus / CPU speed contributes to the overall performance (as in memory transfers), the the 680 should get an advantage. Judging the test results, CPU speed is more or less irrelevant for Octane performance. 

My results are very close to the ones posted in the release candidate testing forums (I used the same Octane release, RC3 for both tests), for example here: http://render.otoy.com/forum/viewtopic.php?f=33&t=24319 

I did not test the cards crosswise in the other computer. Windows took several attempts / reboots to recognize any new card when I upgraded from the previous hardware.

 

Best regards,

   Michael