On Mon, May 19, 2008 at 8:51 PM, Buck <kc2hiz@xxxxxxxxx> wrote:
I don't know if it's still the case, but I was told in the past that a
given chip had already failed testing at higher-than-marked speed. That
is, the CPU was intended to run at 4 GHz, failed at that speed, passed
at 3 GHz and was marked appropriately.

Yep, that's the theory. However, the 4Ghz Chip is more expensive than
the 3 Ghz one. Now, assuming you need to deliver more 3 Ghz Chips, and
the yield you're getting is also getting better with each production
cycle, the chance that you'll get an easily overclockable CPU is
higher.

Of course, overclocking production/work systems is completely stupid.
But on home systems, it can be an easy and cheap way to get more
performance for transcoding HD por^W^W^Wcalculating units for
Folding@Home.


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