If you have a Power Mac G4 purchased since August, you may want to check Mac OS X's Software Update system preference pane, or the Software Update control panel in Mac OS 9. A new firmware update, version 4.4.8, is ready for download.
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According to Apple, the new firmware update introduces improved fan speed behavior. It also reduces high speed fan cycling when users run in Mac OS 9.
The update is only applicable to Power Mac G4s with "mirrored" drive doors. Such systems have only been in production since this past August.
No further details were available from Apple as MacCentral posted this article; at that time, the update was only available through Software Update.
This story, "'Mirrored Drive' Power Mac G4 Firmware Update available" was originally published by PCWorld.