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Super MUC, located at Leibniz Rechenzentrum is an IBM Dataplex DX360M4 with 147,456 cores. It features Intel Xeon E5-268 8c 2.70GHz and reached 2.897 PetaFlop/s on the Linpac performance tests.
New to list is Dell's PowerEdge C8220 system called Stampede is installed in the Texas Advanced Computing Center at the University of Texas in Austin.
Stampede uses the brand new Intel Xeon Phi processors (previously known as MIC) to achieve its 2.6 Petaflop/s.
China's top supercomputer Tianhe-A1 was the fastest supercomputer in November 2010. It is located at the National Supercomputing Center in Tianjin.
It's 186,368 cores reached 2.566 Petaflop/s.