hyperthreading : Computer Hardware Buyers’ Glossary

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hyperthreading
A single CPU (Central Processing Unit) that pretends to be two independent CPUs (Central Processing Units) to the software. It can thus execute two program threads simulaneously. This improves performance when many programs are running at once. You might get 110% to 130% of a regular single CPU. Don’t expect it to perform like a true dual pair, though. Sun has built SPARC CPUs with 4 cores (CPUs) that looks to the software like 32 CPU s, so 32 threads can be executing at once as far as the software is concerned.

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