Probably more relevant is the greatly reduced clock speed (ignoring that the brain doesn't so much have a centralized clock - neurons only fire at <1k Hz compar

Probably more relevant is the greatly reduced clock speed (ignoring that the brain doesn't so much have a centralized clock - neurons only fire at <1k Hz compared to the ~2k Ghz processors used in clusters). The technology also seems somewhat incomparable. The purely chemical signal processing at the synaptic cleft presumably saves a lot of power.