Topic: ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH - page 346. (Read 528055 times)

The info slip that came with miner mentions using 2 sockets (ie: 2 circuits ). I'm using the add2psu because the 860 is powering 2 hashing boards and may be slightly low for them. So it draws extra power (~30 watss I'm guessing)  from the 750. I think you know what I mean as you've had experience with the add2psu. It's the only one that i feel is safe for dolly chaining 2 PSUs. There are others but they look kinda "light" to me.

EDIT: I actually tried using 3 EVGA 600B PSUs first- ie: one on each board and each PSU on its own circuit. I didn't dolly chain the 3 as i felt that wasn't needed since each one was dedicated to one board. Despite having 1800 watts, they could not run the rig above 2500 THS.

Geez what is your power situation in that room? My S4 runs a 15amp circuit just by itself

Its not really necessary. If you're using 2 PSU, you just flip its power switch in the back. If not there's those flip switch sure, but its added hardware that's ultimately superfluous.

You just power the PSU that is NOT connected to the controller first, then flip the one that is connected to the board last. It doesn't matter if its also connected to boards.

Its just that the boards don't actually power up and start running even though they are connected to a power line until the controller "wake" them up.

Mine still haven't shipped. 

On another note, woudl be nice if BITMAIN would actually check their support tickets!! 

Why would that matter? My guess is that the 1 PSU alone didn't have enough power?

Regarding adding multiple PSU's etc, I can recommend add2psu adapters. http://www.add2psu.com/
You could get these to power the hashing boards first, and controllers later.

I used them on my GPU rigs back in the day.

Edit:

DO NOT use these on multiple circuits!

Are you sure about that ATCkit? I guess you are if you're doing it! ^^

I'm running my S7 on 2 circuits- 15 Amp each. I'm using 2 separate PSUs- Corsair 860i and a Corsair 750Cx dolly chained using an ADD2PSU  (http://www.add2psu.com/).

I'm getting good hash rates. I have free electricity. So I'm expecting to break even at least 1 month before the halving.

but miner will want to upgrade their rig or they will losing money on electricity. the result of  existing miner upgrade alone will likely double the difficulty, yes some miner will quit but new big miner will enter this betting game too.  and if bitcoin price peaked near the halving, im sure that alot of existing miner will spend their coin to upgrade their mining rig.

btw its not about competing with other miner, its simply how to get more bitcoin from your initial bitcoin investmen. ie: if i spend 3 btc, can i get 6 btc in less than 1 year by upgrading my rig ?

This makes you wonder if it would be worth installing a cut-off switch on the power cable that connects to the controller.  This would be helpful if you are using a single large PSU...

Thats good to know...I am waiting for mine to be shipped and plan on using two PSU's to power it.

Cheers. Let me/us know if you encounter more problems.

Meanwhile i'm itching to get a S7 myself but its pretty hard to put up so much capital up front when the difficulty going to be going much higher over the next several months.

I had 1 PSU powering the boards and the controller.  I put another psu on the controller and booted up the boards first, and now it is running at full speed.  Thanks for the advise you two..

Thanks Viro, I'll dig into it now.  Should have noticed the temp dif..

seems 2 mins of run time is hardly enough time to check hash rate.... also Bitmain said to make sure you power up the boards first then the controller.

Thats because, basing on the temp reported. One of your board is clearly not hashing. Your #1 should be at 60C~ according to the other 2 temps and its just sitting at 33C which is probably close to your ambient temp.

You're gonna have to make sure its properly connected and working. Mess around with it to determine whether its just not properly connected or if its dead and need RMA.

Anyone else getting a low hash rate?  I'm using 3 hp server psus on 120v, 800w each.  All of my chips show 0, but my average hashrate is just over 3tb.

A normal 20amp 110v circuit will work fine to power one miner. You only need a 220v if you use a 220v PSU most are just using a couple 110v PSU's or a larger 110v PSU.

Thanks for sharing your thoughts, QuintLeo.

I'm always open minded and it's good to hear opinions from different sides of arguments.  I have to go to bed now.  As it is 4:41am for me and I can barely keep my eyes open.  I'll respond a bit more later.  Have a good evening or day [Depending on where you are].

Cheers

PS - I would agree their ROI takes less time because of obtaining their rigs at cost.  However, we also have to look at what action this breeds.  If one manufacturer did this, another would do the same for market share.  Which thereby would increase the amount of time it would take for ROI even though the price they paid was at cost.

The only way I see a manufacturer possibly obtaining significant market share is by over whelming force.  Meaning, they would have to more than double the network hash rate all by themselves in one big swoop all of a sudden.  That would take a LOT of capital and a LOT of power (electricity).

It makes more sense for the big boys at the moment to just replace old gear with new [more efficient] gear to increase revenue by decreasing power costs.  Getting into a hash rate war for market share will only increase the amount of time it takes to ROI on their equipment, even though it was at cost.

 I would guess that most of those folks are betting on a large Bitcoin price increase around the time of the halfing.
 I personally don't like the odds on such an increase being enough to matter, but won't be shocked to be wrong.

 Doesn't seem to be any other reasonable scenario where the S7 will ever achieve RoI unless your electric is VERY cheap or free.


 There is NO sign of Bitcoin price "following the difficulty" as one person keeps talking about, and no reason for it to do so.
 There IS reason to believe in a jump in price near the halfing (probably a little before) due to speculators jumping in based on "reduced availability" or some such, similar to what happened to Litecoin about a month before IT'S halfing this year (and the price on Litecoin has stayed up some, though not near what it peaked at), but given the much larger size of the Bitcoin market I doubt we'll see it do the near-quadruple at peak that Litecoin did. I'd guess 50-100% jump at most at the peak for Bitcoin, then a drop back down to not a lot more than it is now - other factors like Greek near-meltdown excluded.



 Nope, an S5 or SP20 is still profitable - BARELY - at double the current difficulty and electric around 10c/KWH - but unlikely to RoI if you bought one now as you wouldn't have enough time to get your money back before halfing makes anything pre-S7 UNprofitable at current trends, or even if diff increases drop back under 2% per incriment - free electric and SUPER cheap electric folks excepted.


 Keep in mind that most of the "big boys" ARE in the "super cheap electric" areas of the world, at least for their farming activities, and they're probably paying 60-80% of the up-front cost for their miners that most "home miners" are paying. Makes RoI a LOT easier for them.



 I would bet that they don't, but that they are working on their "NEXT gen" chips pretty hard - I also suspect that the "next gen" is going to be full-custom 14/16nm from all surviving ASIC makers, and that it'll be the LAST new generation and the LAST major jump in performance for 4-6 years.

 Will that happen by July 2016 and the halfing?
 My guess is "not across the board" but I won't be shocked if a couple of them are ready around that timeframe with new hardware.




 Usually, but sometimes competition drives manufacturers into fighting for market share rather than maximising profits in the short term. That's what I'm waiting for, probably in December or so.

We must ask ourselves, "Would it be beneficial for the big players to get in a hash rate war if the price of bitcoin remains the same or not MORE than double at the time of the block halving?"

The price of bitcoin would have to at least double to see twice the difficulty we see now.  For it to be 3x of todays difficulty, the price of bitcoin would have to be 3x what it is today for it to be beneficial to the big boys after the block halving.

There comes a point in time where it is no longer wise to invest funds into more hash rate if the rate of return does not justify such actions.  Doing so will push out the home miner for a while but certainly not during the winter months.  I know I would keep several of my rigs just for the winter months.  So, if a hardware manufacturer that mines for themselves makes a move in a hash rate war, it will not be in the winter.  It will be in the spring or early summer.  Even then, there is much risk.  They will have to acknowledge they will not have as much return during the hash rate war.  They will have to acknowledge they will not have as much return on their investment during the winter months either.

Let's say they do increase the difficulty so high it pushes out other miners.  They did this while also diminishing their own returns for a little while.  What do you think the other miners [who were pushed out] would do if the price of bitcoin rises to a level high enough to offset the difficulty increase?  They will get back in!!!!!!!  Thereby diminishing the big boys returns once again.  Which would make them wonder if the investment they made for increasing their hash rate was really worth it.  They would have to continue investing more money into more rigs to increase their hash rate even more to push out the little guys.  Also, the big boys have each other to worry about as well to make them wonder if it was really worth the investment to increase their hash rate.

So, the big boys have a LOT to think about if they wish to increase their hash rate exponentially.  It could very well back fire on them.  However, it may be a risk they are willing to take if they have enough capital sitting by for the long rainy days that will occur from such action.  Their return on investment would take much longer from such action.  If they add more hash rate after an increase in bitcoin price to push out miners who got back in the game, it would only mean more capital spent and more equipment to be concerned about making ROI.

There is definitely much to take into consideration by the big boys if they wish to get into a hash rate war.

this time i agree with you, now its 1 year before halving and i guess  difficulty after halving would be around 2x or even 3x of todays difficulty.