hyperthreading : Computer Hardware Buyers’ Glossary

by Roedy Green ©1997-2008 Canadian Mind Products
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hyperthreading: A single CPU that pretends to be two independent CPUs 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 CPUs, so 32 threads can be executing at once as far as the software is concerned.
AMD
CPU
Intel
Itanium
Opteron
Xeon

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