I understand your point of view, but humans are limited in terms of processing power/speed/memory though. An ai is not limited by human limits of thinking power.

The gulf between the smartest human being ever and the dumbest human being ever is not really that wide. It's just a small blip in the long line of intelligence progression. There is no reason why this point should be the limiting point of AI intelligence. It is very likely that the stable point of AI intelligence is far beyond human intelligence, from just the sheer quality of processing hardware that exists that is better than, or could become better than human hardware.