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Subject: Re: Some Crafty 16.19 results on my XP 2.44GHz

Author: Jeremiah Penery

Date: 06:36:24 02/20/03

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Prime95 is a real-world application.  It does very intense mathematical
calculation, testing several-million-digit numbers for primality.  I don't
believe there's another program that will detect CPU problems faster.

I overclocked my CPU for a while, and it appeared to be completely stable.  I
could run Crafty for days with no problems, and I never had a crash or bug in
any other application.  I ran Prime95 for a while, where a calculation error was
soon detected.  Of course, when I clocked back to the normal level, the error
went away.

I was running at somewhere near the maximum rated speed for that particular
core, which had about zero headroom to begin with, so the errors weren't all
that surprising to me.  Had I bought a slower chip, I could have overclocked it
to the speed of my current chip very safely, as the core obviously has the
ability to run at that speed.  Overclocking becomes particularly unsafe when one
tries to run at a speed above the normal ability of the core.  Otherwise, it's
not much more than what the manufacturers do by taking chips from the same
silicon wafer and splitting them into different CPU speed bins, as those chips
should be theoretically _identical_.



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