Watson's Brain

"Dharmendra Modha of IBM Research – Almaden, in San Jose, California, hopes to build a shoebox-sized supercomputer with 10 billion neurons and 100 trillion synapses that consumes just 1 kilowatt of power. That may still sound a lot – a standard PC uses only a few hundred watts – but a supercomputer like IBM's Watsonuses hundreds of kilowatts. By contrast, the ultra-efficient human brain is estimated to have 100 billion neurons and at least 100 trillion synapses but consumes no more than 20 watts."

http://www.newscientist.com/article/dn20810-ibm-unveils-microchip-based-on-the-human-brain.html