Computerworld: For many years, the U.S. was home to the world's fastest computer--the 1.75 petaflop system at the Oak Ridge National Laboratory. Now, it appears China has captured the title with its 2.5-petaflop Tianhe-1A.
However, the U.S. isn't giving up on the fastest supercomputer race. Oak Ridge has announced that it is working on a 20-petaflop computer that should be operational by 2012. And IBM is building a second 20-petaflop machine at Lawrence Livermore National Laboratory; it should also be operational by 2012.