Back in late 2004 when the 1.8GHz PowerMac was released users began complaining of random pauses during certain tasks, it has taken Apple a whole year to fix it but finally the update is out.
Apple states the following:
"Some 1.8 GHz models of Power Mac G5 (Late 2004) computers may experience any of the following symptoms:
- The computer may freeze when performing certain video-intensive tasks for extended periods of time, such as a full screen slideshows, QuickTime playback, or some games.
- The optical drive may not eject when you've been using the computer for about two hours.
- Internet Connect may become unresponsive when you've been using the computer for about two hours.
(This issue can affect either internal or external modems that use PPP as well as DSL modems that connect using the PPPoE protocol.) - Attached displays may not wake up properly after the computer, running Mac OS X 10.4, has been sleeping for an extended period of time. The computer seems to wake up, but the display doesn't.