IBM and Georgia Tech have coaxed a chip to run at 500GHz, a record for a silicon-based device, by dropping the temperature to minus 451 degrees Fahrenheit.
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500GHz Sub-Zero Processor
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At room temperature, the IBM-Georgia Tech chip operates at 350GHz, or 350 billion cycles per second. That's far faster than standard PC processors today, which range from 3.8GHz to 1.8GHz.
Whole CPUs at this speed would also need to be very small since the speed of light is an upper bound of how short you can make a cycle in relation to the length of the leads in a cpu...
Press release from back then.
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