You have to think like this, CPU are designed to last for 10/20 years at least ( i've seen this
on intel's site don't have a link here ) at "normal" conditions, currect operatins temperatures
and voltages....
But CPUs these days are designed all in the "same" way but with different speeds, that's way you
can overclock it, let's say intel/amd produce 1k 1G processors, for sure they won't sell all 1k
processors because they are more expensive so they "underclock it" and sell like 30% at 700, 30%
at 800, 20% at 900 and 20% at 1G. The big problem is that they lock the specs of the processor
to avoid them be remarked ( intel locks multiplier, amd "locks" fsb ).
So your P3-700 can probably acheive 933 if you set its fsb to 133... and with a good cooler
you shouldn't have any problems....except for you memory if they are rated PC100 only and can't
handle more...so lets say that at the most will probably take 10/15% if your total CPU lifespan.
Are planning to keep that CPU for more than say 4/5 years, the longest I had a processor running
was a 3 years for my P133 and that was pushing it....