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<p><b>Memory latency</b> is the time (the <a href="page.php?w=latency_%28engineering%29">latency</a>) between initiating a request for a <a href="page.php?w=byte">byte</a> or word in memory until it is retrieved by a <a href="page.php?w=central_processing_unit">processor</a>. If the data are not in the <a href="page.php?w=CPU_cache">processor's cache</a>, it takes longer to obtain them, as the processor will have to communicate with the external <a href="page.php?w=computer_memory">memory</a> cells. Latency is therefore a fundamental measure of</p><p>
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