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expansion card

noun, Computers.
a card in a computer on which additional chips can be mounted to expand the computer's capabilities.
Also called expansion board. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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expansion card in Technology

A circuit board which can be plugged into one of a computer's expansion slots to provide some optional extra facility such as additional RAM, disk controller, coprocessor, graphics accelerator, communication device or some special-purpose interface.
Different computers have different standards for the cards they accept, e.g. PCI.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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