influence CPU performance with Cycles rendering

How much influence does the processor have when I render animations using Cycles with GTX580.
Important for choosing AM3 + or the cheaper FM2 + bot 4 core CPU.
Or do I notice that hardly by GPU rendering ?

Once the BVH is built and sent to vram, there is very little interaction between CPU and GPU.

OK does this mean that for example a 4 or 6 core cpu will not shorten the total rendertime so most important is the GPU card.

Assuming everything else is equal, a 6 core cpu vs a 4 core cpu will shorten your rendertime by a third of the bvh build time. How much that amounts to depends on your scene complexity, but usually not much at all.

thanks that I wanted to know

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