Clocked as world fastest: US Titan supercomputer
20 Petaflops (20 trillion calculations per second)
299, 008 opteron cores
18 688 GPU accellerators
710 Terabytes memory
Built for science: magnetic systems, bioenergy and molecular dynamics, nuclear reactors and climate change.
Wiki:
http://en.wikipedia.org/wiki/Titan_(supercomputer)
Official:
http://www.olcf.ornl.gov/titan/
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Transhuman Mind