The BlueGene computing cluster at IBM's Thomas J Watson research centre has topped the rankings for supercomputer energy efficiency.
The next-generation system delivers 1,684.2 megaflops per watt of power consumed, according to the latest Green500 rankings.
Second place went to the Tokyo Institute of Technology's HP Proliant cluster, which logged 958.35 megaflops per watt.
IBM estimates that its new BlueGene system is 77 per cent more efficient than the Proliant cluster.
The company plans to deploy the BlueGene system in 2012 for use by the Lawrence Livermore National Laboratory and Argone National Laboratory.
"As a research and development laboratory, we depend on large high-performance computing systems to fulfil our national security missions," said Dona Crawford, associate computation director at Lawrence Livermore National Laboratory.
"By reducing energy costs, we are able to make high-performance computing resources available to more researchers and their collaborators, advancing science and the computing applications that make it possible."
IBM's high-performance computing technology was responsible for 17 of the 20 most efficient systems in the world in the previous edition of the Green500 rankings in July.
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