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A mere three minutes later, those thousands of processors had solved over 10 billion calculations accurately.
For comparison's sake, a modern PC can manage around 100 billion calculations a second.For the contest, Watson had to rely entirely on its own resources.
The model being used on the Passaic can make a single calculation about once every 10 seconds, which is equivalent to around 720 billion calculations for every one of the years into the future being studied.
But together, the computers would climb to 23rd fastest, capable of nearly 200 billion calculations per second.
The powerful PlayStation 3, which uses an IBM-Toshiba-Sony chip that can do 256 billion calculations a second, costs $400 and was late coming to market.
It reached a peak speed of 19 billion calculations per second, making it the 315th most powerful supercomputer in the world.
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Summit is also an important stepping stone to the next big prize in computing: machines capable of an exaflop, or a billion billion calculations a second.
Alex Aiken, director of the new Computer Science Division at the Department of Energy's SLAC National Accelerator Laboratory, has been thinking a great deal about the coming challenges of exascale computing, defined as a billion billion calculations per second.
This involves building a machine within the next few years that's capable of a billion billion calculations per second, or one exaflop, which would make it five times faster than Summit (see chart).
As Babbage explains in an earlier post, it is also energy efficient, at least as supercomputers go, crunching two billion calculations for every watt consumed.Together with Sequoia, Mira is the latest in IBM's Blue Gene range, the result of collaboration between the computer giant, Argonne and Livermore labs.
The differences between the two calculations are dramatic.
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