A suggestion for those with freezing dual-core 2.3 G5s (and maybe others)

I'm on my second dual-core 2.3 that's showing the random instability that many others are describing on the boards. To summarize:
- The kernel panic screen usually (but not always) appears.
- Within 10-20 seconds of the crash, fans come on full bore.
- Nothing of substance is recorded in the logs (at least not that I've found).
- Problem occurs with stock RAM as well as 3rd party modules.
- Crashes usually occur soon after a period of steady processor activity (playing large QuickTime movies, transferring files over the network, etc.)
- Problem exists under both 10.4.3 and 10.4.4.
- Apple's hardware test reports everything's fine.
- I've never been able to keep the machines up for longer than 3 days.
So I decided to give something a try that I happened to see in one of the many posts on the topic. In the Energy Saver pane, I've set Processor Performance from Automatic to Highest. And guess what? I've been doing all the same stuff I've always done, and haven't crashed for 6 days!
Just curious if others with similar symptoms have success with this...
Troy

Troy:
I've been using my PM dual core 2.3 GHz hard since November with nary a problem. I usually keep the Energy option at Automatic, unless I'm going to be running heavy-CPU database processes, when I set the CPU to Highest.
And I do watch movies fairly often on the 2.3.
I always use Software Update for OS and Security updates. I've been updating my Macs for years this way, and haven't seen a kernel panic since OS X 1.0. Permissions repair is always run before and after updates.
Cocktail and DiskWarrior are run periodically for maintenance. I probably run Cocktail every week or so, and DiskWarrior every few weeks just as preventive measures.
Knock on wood, this has been a very stable computer.

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