Pre-overclocked cards are the same cards as the non-overclocked reference cards, and chances are they won't be that much more efficient, or have longer lives. It is possible for them to be better overclockers though.. most manufactures have a form of quality assurance; the cards must work in their overclocked state. If they don't they will either be thrown in the regular batches or something along those lines. So buying a pre-overclocked drastically reduces the chance of a getting a dud, not much more though, as their is no further assurance that the card can go any higher.
I would think the manufactures OC at the same level we do, I can't be certain though.. however I don't think there is a "better" way of overclocking, a way that better assures stability, etc.
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