In reply to:

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Which kind of begs the question, why were you overclocking a machine that never gets CPU-intensive workloads?

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The question is extremely appropriate, and the answer is simple :
It was a very stupid matter of principle (and less stupid curiosity)! I had it overclocked for years and would not understand why on earth the OS would not install.
(btw, I am talking of the famous Celeron 300 Mhz "Mendocino" which would run at 450Mhz, anybody remembers?)

Anyway, still working fine at 450Mhz. It's a machine I use for testing, now and then, and honestly I don't really care whether it runs @300 or @450, as long as it runs.