Depends on how much you want to stress a system, at 10 passes with IBT most systems are pretty stable, but that does not stop me from doing 20 passes with IBT (8GB of RAM, so it takes a long ass time) and 24 hours with Prime. And yes, a few times with running IBT I got an error at about 15-18 in the run, so I ended up upping my NB voltage a tad and no more errors.
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