ocing a chip will kill it thogh(sooner or l8r)
Not if you do it right and know what the hell you are doing. It'll shorten the lifespane but the lifespan is like 50,000 hours so oh no you'll probably have 45,000 instead of 50,000 hours.
I think you'd sooner have to worry about EMI than electromigration, but I don't know...eitherway I haven't heard of any overclocker post on the forums due to 'electromigration' failure.
Some details on electromigration if anyone cares
by the way even keeping a cpu cool will not prevent it from eventualy dying due to the restrictions of the hardware,for instance a copper 2/0 wire will only carry so many amps for so long,eve if cooled down ic can still only limit out at so much.
This is true, BUT in the case of processors people have had a lot of successful overclocks lasting for up to 2 years strong. I don't know how often that actually occurs though =/ But generally if you can overclock your system and run prime95 for 12 hours straight and have no stability issues then your computer will be fine and last you until your next upgrade.