I saw this news but I am wondering why it is not using nVidia GPU. I suspect next year will see a Fermi-based super computer.
http://news.download3000.com/ornls-jaguar-named-worlds-most-powerful-supercomputer/
According to the TOP500 Organization that publishes the list of the top supercomputers, the Oak Bridge National Laboratory, or ORNL, has the world’s most powerful supercomputer model based on GPU. The powerful complex system is known as the Jaguar, or Cray XT5, features a quarter million cores powered by the ATI Radeon RV770 technology. Using the six-core AMD Opteron processor, Jaguar enables 2.3 petaflop/s peak performance, as well as 1.75 petaflop/s performance, according to the Linpack benchmark.
AMD technologies also power the fifth high-performance supercomputer system called Tianhe-1, featuring the ATI Stream technology and 563.1 teraflop/s performance at 5,120 ATI graphic processing units in the RV770 architecture. It is used in China, while the Roadrunner with dual-CPU and AMD Opreton processors is the former number one supercomputer system.