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June 09, 2017, 10:38:09 PM |
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They are built to run 24/7. Powering them up and down is actually worse for them.
The build quality can vary depending on batches and a number of other things so there is no way to quantify this. You may have one die in a month and another runs 5 years.
The only user servicable parts are the fans, cables, and controller. (If it is under warranty do NOT do anything yourself without bitmains permission or it voids your warranty)
Board level repairs require a fair amount of experience and knowledge that is not publicly available. 99% of people will have to send them in for repairs.
S9s are known for having faulty hash boards. That is really the main issue with them. The only other issue I can think of off the top of my head is they are a bit more sensitive to heat than other comprable miners in my experience. As long as you keep ambient room temps down where they are that shouldnt be a concern.
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