Re: Bitmain's Released Antminer S9, World's First 16nm Miner Ready to Order

I have 51 Running. 4 have one bad board. They have run around 3 months.

Sorry to hear Undecided

This is a good example and closer to the truth.
7.8% failure rate in this case.

Isn't it actually 2.6% (4 of 153 boards total)?

Your way is correct too, I meant faulty units of total 51 units.

So, it is 7.8% failure rate unit wise and 2.6% failure rate hash board wise.

I think it is closer to reality to talk about failure rate per unit, as Bitmain wants the whole miner to be send to the repair if it is made after certain date.