Assuming the space required to run watson halves every two years and v:: of the human brain is v1 = 1500cm³, and Σv of Watson's servers = v2 = 90 x (17.5cm x 44.0cm x 73.0xcm) = 5.05e6 cm^3.
So Watson will be the size of a human brain in t = - ln(v1/v2)/ln(2).
Assuming the space required to run watson halves every two years and v:: of the human brain is v1 = 1500cm³, and Σv of Watson's servers = v2 = 90 x (17.5cm x 44.0cm x 73.0xcm) = 5.05e6 cm^3.
So Watson will be the size of a human brain in t = - ln(v1/v2)/ln(2).
We're looking at 11.7 years. So, 2023.
* Source: http://en.wikipedia.org/wiki/Watson_%28artificial_intelligen...
"Watson is made up of a cluster of ninety IBM Power 750 servers..."
* Source: http://www-03.ibm.com/systems/power/hardware/750/specs.html
"175 mm x 440 mm x 730 mm"