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The Green 500 List

The ranked top 500 Green supercomputers measured by MFLOPS/Watt and total power suggests the current Green computing limits using current technologies.

The genesis of this list started back in April 2005 – after a keynote talk by Dr. Wu-chun Feng at the IEEE IPDPS Workshop on High-Performance, Power-Aware Computing. The notion was then formally proposed a year later at the aforementioned workshop with a paper and associated talk entitled "Making a Case for a Green500 list." A subsequent presentation at Clusters and Computational Grids for Scientific Computing 2006, entitled "Global Climate Warming? Yes … In The Machine Room," led to more fervent interest, and ultimately, the announcement of the Green500 at SC|06. One year later at SC|07, the inaugural list was released and a new era of Green Supercomputing began.

The top 10 of the Green500:  http://www.green500.org/lists/2008/11/list.php
The Green500 list: http://www.green500.org/lists/listdisplay.php?month=11&year=2008&list=green500_200811.csv&start=1&line=101

As of about June 2003, most of the top500 ( http://www.top500.org/overtime/list/32/osfam ) supercomputer sites are running on an open-source operating system. By June 2008, over 80% are running Linux or a BSD derivative.