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overclock

[oh-ver-klok] /ˌoʊ vərˈklɒk/
verb (used with object)
1.
Computers. to modify (a hardware component, as a processor, graphics card, or memory) so as to increase the speed of that component beyond the specifications of the manufacturer:
You can overclock your video card to improve its performance.
Origin of overclock
1985-1990
1985-90; over- + clock1 ( def 6 )
Related forms
overclocked, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for overclocking

overclocking

/ˌəʊvəˈklɒkɪŋ/
noun
1.
the practice of modifying a computer (esp with a cooling system) to allow its processors to run at greater speeds than the manufacturer intended
Derived Forms
overclocker, noun
overclock, verb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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overclocking in Technology

hardware
Any adjustments made to computer hardware (or software) to make its CPU run at a higher clock rate than intended by the original manufacturers. Typically this involves replacing the crystal in the clock generation circuitry with a higher frequency one or changing jumper settings or software configuration.
If the clock rate is increased too far, eventually some component in the system will not be able to cope and the system will stop working. This failure may be continuous (the system never works at the higher frequency) or intermittant (it fails more often but works some of the time) or, in the worst case, irreversible (a component is damaged by overheating). Overclocking may necessitate improved cooling to maintain the same level of reliability.
(1999-09-12)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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