Quote from: vinylwasp on January 02, 2017, 01:31:10 AM

Quote from: QuintLeo on January 01, 2017, 09:04:23 PM

On the other hand, while this thing appears to be quite a bit more efficient than the A4, I also have to wonder what the RELIABILITY is going to be like - the history of issues with the S7 and S9 do NOT fill me with confidence.

That's an interesting factor that anyone considering the L3 would be wise to factor into thier ROI calculations.

If the quoted Mh/s for an L3 is +/- 10%, lets assume that it's 'real' rate is 237.5Mh/s (-5%) and factor in 2-3% rejects we're now at 230Mh/s on Pool.
Then if the failure rate is 10-20% as others have said (lets use 10%), your real-life Mh/s (taking in miner failures) could be 205Mh/s across your fleet while failed miners are offline (perhaps permanently?).

If you bought 10 at $1800 landed on your doorstep but 2 failed (20%), your real cost per (funtioning) unit is $18,000/8 = $2,250.
And if you send them away to be repaired, your cost for those miners is $1800 + opportunity cost (lost mining profits per day) + shipping and repair costs.

In this respect, I've always wondered what the real cost of ownership/net present value is been for Titan's too.
At $10,000 each plus repair costs, I wonder if they've ever paid for themselves and at what electricity price per Kwh that happened?

On the other hand, while I agree the price is too high now, has anyone ever had an Innosilicon card fail, and under what circumstances?

I don't know of any Inno A4 hardware failures yet. I think that says a lot. I too am very nervous about Bitmain's very poor track record and high failure rates. I think it is wise to factor that into the cost equation.

Power efficiency really comes into play if the DIFF takes off much higher and miners start to become unprofitable, but how high does diff need to get before it pinches the bottom line of the Titans and the A4's really? And if it reaches that price/diff ratio how many people will just sell their equipment and call it a day?