It doesn't matter if you look at speed (seconds/operation) of efficiency (joules/operation). For most mathematical operations, a computer cpu will outperform a

It doesn't matter if you look at speed (seconds/operation) of efficiency (joules/operation). For most mathematical operations, a computer cpu will outperform a human brain by many orders of magnitudes. This is both true and a somewhat irrelevant. It is a bit like saying that a cpu can run recursive, non-parallelizable algorithms faster and more efficiently than a GPU, even if the GPU has more flops. The GPU optimized to run a few types of computation very quickly, and is very slow on other tasks. This applies to the human brain as well, and to a much greater degree.