Just like any other card they die if you abuse them to death. Plus some people got faulty cards from the factory and there is a fud thread where every faulty 570 gets blown out of proportion. Some cards posted were even faked.
Actually, I'd like you to point me to the "fud thread" detailing deaths of people's 580s -- oh wait... that's right -- there isn't one. So either no one has overvolted and "abused" their 580 or the 580 is a much studier and more OC friendly card than the 570. The OP wants a card that will last so even though I own the 570, I won't recommend it to him because the fact is that the VRMs are weak and it MAY die when overvolting.