"This update is only for the 1.8 GHz, single-processor Power Mac G5 (Late 2004) computer and supports installation on Mac OS X 10.4.3 or later. Also improves the reliability of your Power Mac G5, especially after it has been inactive for two hours.: http://www.versiontracker.com/dyn/moreinfo/macosx/405 ------------------------------------------------------------ Robert Church Coastside Guitar Lessons Great Guitar Lessons For Kids, Teens and Adults www.coastsideguitar.com