Topic: ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH - page 326. (Read 528055 times)

Well, after all discussions here, are the S7 is good thing to enforce the mining farm with? Sure, their efficiency is good (and it's definetely the best available for upper-home level miner for now), but what about their reliability? 

I am still waiting, paid unshipped comfirmed, My bitmain acount create time 2015-09-02. bet I get a 4.6 model aswell! I hope they compensate with something more than just coupons....
Still BITMAIN is the best for home miners but they are slacking!

It is not a big deal, I have had it happen several times over my orders.  I wish they moved it up to payments in 1.5 or 2 hours would make life easier for all.

But I do suggest emailing bitmain with all the information.  That is quickest way to get it fixed.  Keep in mind when they go to work from holiday they likely have backlog of emails so might be a day or two after.

I just made an order and the same thing happened to me.  Don't Worry, it has happened to me once before when ordering an S5.  They will acknowledge your payment and your order will be put in the order that it was received.  No Worries.

Wow very suprising on that.  I was hoping with difficulty looking like it was not to slow considering China having holiday that the S7's were being delivered.   I am pretty amazed on the month since payment.

I wonder if they will do coupons and how much they are worth.   Will be interesting once they start working again.

Just to post an update, my unit has been running for 10 days straight. Hashing at Eligius using 1,000w EVGA on two boards, and 650w EVGA on one board and controller. Just using stock speeds, have not tried overclocking.


https://i.imgur.com/gmm7NBr.jpg

I'm still waiting with no shipping notice and no tracking.  I ordered and got confirmation on Spetember 6th.

No not saying that, just an observation. Don't know the reason.

Are you saying those two hashboard died because they were not powered at the same time as the controller? If they are all on the same PSU, they will all be powered at the same time, it does not matter afaik which board the controller is connected to.

But if you were powering the two boards on two different source, then that would be a pretty dread possibility that doing this can damage your hardware...

The last two hashboards I lost on s5's were the ones NOT connected to the controller.
At least it was easy to combine two hashboards from two half dead s5's and make a good one.
Also running an s5 with a bad hashboard connected will usually lock up after a bit for me but if you pull the hash cable off
the bad one it will run the other one by itself just fine.

hashrate being too low.

I'm not sure WHY but what do happen is that when a board is "powered" without a controller. Its not actually "on" its just connected to the energy supply. Then when the controller turn on, the blades all light up simultaneously.

I think there is probably not much risk to the hardware but its best to be cautious. Its probably just an issue of the controller sending a call to the boards and if its not already connected to an active power supply, it does not answer and thus is considered dead.

This scenario happens with s5 controllers and hash boards also.
The s5 controller gets power from ONE hashboard so they would both go on at the same time.
The other hashboard however may not get powered at the same time.
I've had to soft reboot when the second hashboard chips don't show up live after a power on
or when nicehash does a pool switch and the hashrate goes to ZERO on the miner.
Sometimes it never comes back and locks up, other times one hashboard comes back and no amount of soft reboot
will fix it. At that point a power cycle is needed.

Glad I have the remote control PDU's so I can remotely power cycle instead of going the the PSU
and toggling the switch.

It's a great pity that we are having to guess why the instructions are to power up the Controller after the Hash boards. It would be much more useful if we were told what the problem(s) are if this is not done....

So to continue the guessing. In practice I suspect that most users are doing what they have always done and are powering up Controller & Hash Boards simultaneously, and are getting away with this?

There are then some reports of S7 that seem to have a lower Hash Rate & Higher HW errors either at switch on or after a power outage, that can be fixed by a Software Reboot, which could be interpreted as being the same as powering up the Hash Boards first, so perhaps this is the reason?

My latest best guess on the reason is nothing to do with the above problems but all to do with the fact that the controller now has a separate supply whereas in the past it was powered from the hash board and hence was powered simultaneously, with no risk that the Controller could be powered & the Hash Board not.

I think what Bitmain is guarding against is a situation where only the Controller is powered at the point that the Hash boards start taking power. The reason being that I suspect there is then a risk that the unpowered Hash Board attempts to take current from the Controller?

Unfortunately just another guess, but there you go.  


Rich

Yes you can fix it.
I've simply had the board not boot because it is not detected at boot.
I would probably avoid doing this as i'm unaware if there might be electrical issue related to this that would cause hardware damage.
Anyways, a soft reboot worked for me, but i didn't repeat the experience. Also a power cycling would definitively fix it if no damage was caused.

Do we know what the result is if you power the controller before the hash boards?
Do the hash boards not get detected?
Can you fix it with a soft reboot?

August 31 purchase and confirmation for one.
It was shipped 7pm on September 30.
I have more that where purchased sporadically during September that have no tracking yet.
October 9 seems to be the magic day.

I get the feeling they are more worried about wattage being out of spec too high than

I'm still waiting, they shipped the PSU's straightaway, but not a word on the S7's yet.

A screen shot of the gui can help us

read my thread here

https://bitcointalksearch.org/topic/m.12558597

Also you are quoting some very broad ranges of Hash Rate, how long have you tried running for?

Rich