You may be interested in the Blue Brain Project: http://bluebrain.epfl.ch/

As for capacities for human memory, I think that's the sort of question that begins from a difficult premise that memories have a format comparable to what you store in electronic bits in a silicon-based computer. Even if we can take the folklore about working memory having a capacity of 7 + or - 2, the caveat on that insight has always been that the 7 + or - 2 *things* that can be stored  can be changed based on the intention, mental set, or elaboration employed by the person.  The analogy between mind and computer is tempting, no doubt, but the concrete details of this proposed parallel are troublingly elusive. 

Best wishes,

Damian

I think never because if you just are able to study one synaptic bond it has marvelous and wonderful information which is not even possible to design by any human intelligence.

Dear Yinghu! We accept the successes of science. We are taught by the experience of Jules Verne and Leonardo da Vinci. So, in the near future chip' memory will exceed the amount of memory of man. Our group is working in this direction. But what's next? The memory is one of the brain functions. It is well known that the creative activity is not always associated with a good memory. Will science quickly ensure the birth of brilliant ideas in the chips? Or the best way is - the combination of living nerve cells with planar sensor chips? Another question. Man has emotions, motivations. And whether artificial devices will need ill patient? Chips without emotion will not complain of headache, fatigue. So, why artificial chips needed sickly people. People complain about a lot of ailments. Conclusion with some irony, what kind of future awaits the people compared to chips without emotions?