Topic on Glossary talk:Central Processing Unit (CPU)
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Released in July 2006, it should only be required for AMD non-single-processor-and-core systems based on K8 microarchitecture (Athlon and Turion X2, Opteron). Starting from Vista or 7 though (and depending on the games using Windows apis or not) it may not be needed anymore.
There were also additional issues on top of that related to CnQ.