System Management Unit: Difference between revisions

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The '''System Management Unit''' ('''SMU''') is an advanced internal subsystem introduced in late 2004 with the [[iMac G5]] and [[Power Mac G5]] series computers. It manages the functions previously governed by the [[Power Management Unit|PMU]] (Power Management Unit) as well as additional cooling functions.

==Overview==

The SMU manages thermal and power conditions to optimize the power and airflow while keeping audible noise to a minimum. Power consumption and temperature are monitored by the [[operating system]], which communicates the necessary adjustments back to the SMU. The SMU makes the changes, slowing down or speeding up fans as necessary.

Resetting the SMU may fix certain problems during [[troubleshooting]]. <ref>https://web.archive.org/web/20081227234016/http://support.apple.com/kb/HT1436?viewlocale=en_US</ref>

== See also ==

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==References==

{{Reflist}}

* Owen W. Linzmayer (ed.). ''Desktop and Portable Systems: Second Edition''. {{ISBN|0-321-33546-5}}.