For the first time since November 2009, a U.S. supercomputer sits atop the TOP500 list of the world's top supercomputers. And the winner comes out of IBM.

Dubbed Sequoia, the IBM BlueGene/Q system installed at the Department of Energy's Lawrence Livermore National Laboratory achieved 16.32 petaflops on the Linpack benchmark using 1,572,864 cores. In all, four of the top 10 supercomputers are IBM BlueGene/Q systems.

http://www.cio-today.com/news/U-S---IBM-Regain-Supercomputer-Crown/story.xhtml?story_id=102006PD7R6U&full_skip=1

I can only do one flop at a time... and it's always one flop too many...