Of course its been 4 years since i had that PC and now its crunching in a dudes rig here on TPU. Id say that a lifespan dosent need to be that long considering tech gets seriously aged in a few years. 1.55v is max safe voltage to put through a 939 chip. By safe i mean theoretical safe limit before cpu degredation at 1.6v. But i ran mine 24/7 at 1.6v no problems and even folded with it. I won a F@H contest with it a long time ago actually lol.