Sequoia, the IBM BlueGene/Q system installed at the Department of Energy's Lawrence Livermore National Laboratory, took the first place in this year's Top 500 world's supercomputer list, followed by K computer at the RIKEN Advanced Institute for Computational Science and another IBM super computer Mira in the DOE/SC/Argonne National Laboratory, according to the latest edition published in June.

Sequoia can perform 16.32 petaflops (quadrillion floating-point calculations per second) and is also one of the most energy efficient systems.

The Tianhe-1A system installed at National Supercomputing Center in Tianjin dropped from first 2010 to fifth place. Another Chinese system, Nebulae, dropped to the 10th.

The list is compiled by researchers at University of Mannheim, University of Tennessee and National Energy Research Scientific Computing Center.

   Nebulae, China

Nebulae [whatsontianjin.com]

Site: National Supercomputing Centre in Shenzhen (NSCS)

System URL: -----

Manufacturer: Dawning

Cores: 120640

Power: 2580.00 kW

Memory: -----

Interconnect: Infiniband QDR

Operating System: Linux