A few random thoughts.

One thing that always seems to get missed in a comparison of render engines, is what the final renders will be used for. Fast does not always mean accurate, neither does slow unfortunetly. Comparing render engines will always be full of opinions, etc. Because in the end we are what is looking at it.

Comparing GPU to CPU rendering is not so easy to do. It doesn't matter how good a GPU render engine is, if it runs out of memory or has to do tons of memory swapping.

Comparing the number of CPU cores is tricky. just because one has twice as many cores or twice as fast does not always mean it will be twice as fast. But it could be way faster.

Compare an 8 core I7 (990x) to a 16 core Xeon (E5-2687) ... The Xeon will be more than twice as fast in every type of benchmark including rendering. Doesn't matter is if is CPU or GPU rendering either. The Xeons systems memory pipelines are faster than any I7 system.

One of the best things you can take away from Art's examples here. Is that he actually put together real numbers. That sort of takes the guess work out of it with the scene(s) he used.

Lets face it, there are other things better to argue about then the numbers Art took the time to put together.

Use what ever render engine you want to, and if your thinking about getting another one maybe the numbers Art put up will help.

Thanks for puting this together Art.

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