I've downloaded and unzipped the Throttle Stop software to diagnose a problem with a power saver option. I had set the multiplier to 26, which 'got stuck there' (though I am able to change it, I can't get it to take effect.) Though this might be a user error, this detail is just some extra background info and likely not important.
Now when I don't start Throttle Stop and run a CPU intensive task, the CPU GHZ switches to that which it was with a multiplier of 26. I have to start the software and with Disable Turbo selected am able to keep the CPU from 'overclocking itself.'
I went as far as deleting the software, but without an install process, I wasn't surprised that this didn't eliminate the spontaneous overclocking. Any ideas where I might need to look to tame the CPU?