Scientific American 
October 27, 2011
Supercomputers can store more information than the human brain and can calculate a single equation faster, but even the biggest, fastest supercomputers in the world  cannot match the overall processing power of the brain. And they are nowhere near as compact or energy efficient .
Nevertheless, IBM is trying to simulate the human brain with its own cutting-edge supercomputer, called Blue Gene . For the simulation, it used 147,456 processors working in parallel with one another. IBM researchers say each processor is roughly equivalent to the one found in a personal computer, with one gigabyte of working memory.