Oak Ridge National Laboratory on 29th Oct2012 made operational the worlds fastest Supercomputer ---the Titan supercomputer is a Cray machine made of nearly 19,000 processing units stitched together with 710 terabytes of memory.
Claiming the first place it made 'Sequoia' second-most-powerful supercomputer with a crunching performance of 20 petaFLOPS.
i.e this machine can perform 20 thousand trillion calculations per second.
The Cray Titan is expected to be number 1 on the TOP500 list November 2012 update in a supercomputing conference in Salt Lake City.