According to the TOP500 list, the fastest computer in the world as of Nov. 12 was the Cray XK7, which uses 16-core AMD Opteron processors.
But despite advances in CPUs, optical networking and other tricks, high performance computers have a weakness: Their size.
Simply put, the more components in a supercomputer the greater the odds something will break.
A non-super chip for a supercomputer
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