1) It will take time for Bitfury to deploy that much new equipment. ESPECIALLY with the current yield issues on 14/16nm process from ALL manufacturers on that node.
2) Bitfury has quite a bit of competition already deploying more and more gear
3) Other folks have already announced tape-out or are working on 14/16nm chips


 Note that KnC announced tapeout on their 16nm "Solar" chips almost a YEAR ago and announced deployment of those chips a while back, yet their hashrate has NOT exploded since then.

 Will BitFury hit 1000 PH? Quite possible.
 Will BitFury hit 1000 PH before halfing? Almost IMpossible.
 Will BitFury hit 1000 PH by the end of NEXT year? Unlikely.
 Will the total hashrate of the entire network hit 2000 PH before Bitfury gets 1000 PH of that deployed? Very very likely.

 Keep in mind that there are still SEVERAL folks making chips/gear, BitMain is just the only one CURRENTLY selling to the public (Innosilicon and Lktec have already made announcements, there is that one thread about a rumoured Avalon next-gen machine, Spondoolies has already announced next-gen, plus the other folks that don't sell to the public....)

Keep in mind that folks that rent out mining rigs expect to make more off the rental than mining with that rig would net them, or they wouldn't bother renting out the rig.

 If it is a 110VAC outlet and you are running those PS at or very close to full capasity, NO.

 Most electric outlets in the US are rated for 15 amps TOTAL (not per outlet, total for the entire socket), and the circuit they are on is usually has wiring sized for a 15 amp max load.

 If those are 90% efficiency at full load, you are pulling over 1900 watts and over 17 amps from the wall with them at full load.

 A surge protector does NOTHING for that issue.

 *IF* you aren't running them anywhere near full capasity, or if it is a 220vac outlet, it should be OK.


  Keep in mind that server and ATX power supply "power rating" is on the OUTPUT of the supply, NOT the input.


 Another thing to keep in mind is that a power company does not guarenttee a constant voltage - your wall voltage WILL change over time, depending on the load other folks are putting on the power company and how that load is distributed. It's best to stay within NEC specified limits as those limits take that factor (and many others) into account.

 Do NOT assume 120 volts, that's a higher-than-normal voltage on a power circuit - 117vac is the "nominal" but 110 is COMMON and sometimes as low as 100vac in a mild "brownout" condition.

 Electric circuits, if you stay within the RATED capasity on amperage, CAN be run safely 100% 24/7 - that's part of what the NEC takes into account - but you do get higher i2r losses when you do so, better to run them a bit under capasity when you can.

 That 50 amp breaker is probably the "mains" input breaker for the whole panel, if you're in an apartment or your in an older mobile home park, and will be your TOTAL limit of power the whole panal has comming into it.
 The wide 15 amp breaker will be for a 220 circuit probably intended for an electric water heater, electric clothes drier, HIGH capasity A/C outlet, or some such.


 The only time I've seen 20 amp circuits in US houses were for circuits leading to a clothes washer or to the kitchen (kitchen appliances can often soak 8-10 amps each and most recent kitchens are assumed to have a few such appliances, like toasters and microwaves and coffee pots etc), or if the house was custom-wired at some point. 15 amp circuits are the norm.



 220 isn't any safer than 110. Both will electrocute you - in fact, 220 is a hair LESS safe but the difference isn't enough to matter on practical terms.

Please do keep in mind that there are many "common" CPU cooler families around with different mounting hole requirements - Intel and AMD have not uses the same size mounting holes since the days of clip-on coolers (and the only heatsinks that used "holes" in those days were the Swiftech 370 and Alpha 8045 types), and even within Intel and AMD there have been a few different "families" of mounting holes. It's possible to design a PCB to support more than one set of mounting holes.

 I'd actually vote for the "clip-on" type cooler mounts, though you'd probably need one cooler for 1-2 chips if I remember the max power draw of the BM1384 correctly.

The S7 itself doesn't seem to be a bad miner - it is the "no bloody way to achieve RoI on it under current conditions for pretty much anyone" PRICING that is the bad part.

 If someone is having to replace a UPS battery every 3 years, they're buying some truely BAD quality batteries for their UPS or their power reliability is VERY VERY bad or they have BOTH poor quality batteries AND poor power reliability.


 Another thing to keep in mind though - probability that if a MAJOR mining facility has lost power, it's ISP has also lost power (but the ISP probably has UPS backup and likely is still up and running for a while).


 If you have high reliability on your power, then it probably makes no sense to put your mining gear on a UPS - but high reliability power is NOT a given in most of the world.

In a "free" electric situation, the only reason to worry about efficiency is to be able to maximise your hashrate - but if you don't have a lot of cash available to buy miners with, buying older lower-efficiency miners might make sence as they tend to COST less per GH, 'till you start getting close to the limit on your free electric supply.

 If the miner dies before it achieves RoI.

 are zero, they already announced they aren't planning to do ANY more "home miners".

The only miners Bitmain are currently selling are the 2 different S7 batches, and POSSIBLY a few leftover U3s.

 S5's were sold out months ago, even the "used" ones.


 I suspect they will introduce a "S7+" model at some point, possibly fairly soon, to try to compete with the Spondoolies SP50 - the engineering for a "S7+" has already been done, just a matter of building them.

300 watts / TH per that web site original poster listed - so a little but not a LOT worse than the S7.

 I crunched the numbers though, and not looking like this Avalon 6 (IF it actually exists and IF the specs and price are correct, between original poster and that Chinese website) will RoI ever even at 3 cent/KWH electric, unless Bitcoin price sees a substantial jump or diff increases flatline REAL soon.

 You're not factoring in that LTC price jumped a TON shortly before the LTC halfing - I'm pretty sure THAT is what drove some folks to turn lots of older, once-unprofitable miners back on - they're now PROFITABLE again, if only a little.

 My suspicion is that the original batch of SF100 units were so poorly designed at the board level that even SFARDS realised they needed to FIX it before they would be able to sell a significant quantity.

Only if you're overclocking them quite a bit, at CURRENT difficulty. 40 S5s at stock clock right now are grossing more like .35/day at best - and that is before electric cost.

It's doubtfull that Bitfury will keep their chip entirely to themselves, but they do limit their sales to LARGE mining farm operators that are capable of doing their own board-level work (MegaBigPower has a LONGstanding relationship with Bitfury, for example) from what I've read.
 Also, it's not real likely the chip is in production in significant quantities yet - 16nm/14nm processes have had a LOT of issues and apparently are still very low yield.

 KnC claims their 16nm Solar chip is in production, but apparently they are having major yield issues (fairly low hashrate increases out of their farm since the "in production" announcement) and they have already said they won't be selling it.
 Given KnC's track record on UNreliability of their miners and excessively long delivery delays, I don't class them getting out of "retail" sales to be a loss.

 Innosilicon announced tape-out of their new generation of chips (one SHA256 one Scrypt).
 Lketc has announced a 16NM-based 5TH miner that appears to be aimed at a December release probably based on the announced Innosilicon A3 but no hard data yet.

 Some unconfirmed rumours about an Avalon 6 machine, 3.5TH at quite a bit lower cost and slightly less efficiency than the S7 claimed to be for an October timeframe release, but some significant concerns about the posibility of it being a scam by the site that announced pre-orders for it.


 As I understand it, GAW never made their own hardware - just relabled gear from other folks.

 Zeus is apparently still around (see the Innosilicon "farm boy" thread elsewhere) but it somewhat of a "rump" form. I can see a possibility of them comming out with an Innosilicon A4-based machine (or line of machines) though, given they appear to have forged some sort of a working arangement with Innosilicon.

 If you look closely at the Batch 2 vs. the Batch 3, they are NOT the same - which is why one is a little lower as it's also a little lower hashrate.

 They tend to adjust prices for a lot of factors, right now it seems they're actually paying a LITTLE attention to those of us that are NOT buying S7s due to RoI concerns.

 They sell the miner seperate from the power supply because quite a few of us don't WANT to be stuck with a 220-only power supply (pretty sad design IMO, there is no sensible reason why they couldn't have designed the PS to handle 100-240 like MOST modern power supplies in the 1600 watt and under range), or prefer other power supplies WITH A BETTER TRACK RECORD OF RELIABILITY or lower cost than theirs (based on what I've read about that APW1600 thing, I have ZERO interest in it).

OP DID say $315/TH in the original post - which would make it a competative unit but not insanely good at around $1050ish.

 No clue where that data came from though, nothing about it on the site they posted.

There IS an "edit" button, could have just edited the original message in the thread you posted the typo(s) in.

 Do note that the ONLY altcoins those units can mine are the SHA256 based ones - and unless you're multimining, it's generally more profitable to just stick with mining Bitcoin with them.

How high are you overclocking your S5s to manage to "burn the hash card"?

 I've had mine running for months now with ZERO failures, and all of them were used when I bought them.


 S5 has been out of production for months, and they sold off most or all of their "used" units.
 No remaining spare boards is NOT unexpected.

 Miners aren't like cars, they aren't expected to last for a decade or two and spare parts tend to be limited to start with.

Looks like Bitmain doesn't think they need as much money as they did during the v3 timeframe, given the MUCH lower rate of return and the much higher cost of entry.

 I am seriously UNIMPRESSED with the v4 contract, and will be looking to invest my profits from my v3 contracts elsewere.