The only possible information I would ever pass onto an offer like this would be if I used BTC. That info would be:
Yesminers receiving wallet that the BTC was sent to, how much, and date/time of the transaction. Aside from that payment information, only quan/type of miners paid for. Don't even need my name.

Being an open ledger BTCflow into and out of an wallet can be fairly easily tracked ad-infinitum including obviously where coins moved/spent out of the receiving wallet go. The hardest part is linking ownership of the various receiving wallets to where/who the coins eventually go to and accumulate.

On glitch in doing a group buy is that kilo17 is out of the BTC game. BlockC really screwed him over when they backed out of his Avalon6 chips deal with them. Within days of that he sold off his 300TH farm mostly hosted by BlockC and told them to get stuffed.

Fun things I've found that make circuits mysteriously work/not work:
probe loading
gentle breezes from cover off vs cover on - and not exactly related to local internal ambient temps
bright light when illuminating for close inspection

What a fun world eh?

Ja. Only drawback is that come summer that ~4kw of heat will then have to be removed from the area via the AC. Come then, I'l just move them to the where the rest of the farm is at and don't impact the AC costs as much. Worked great over the winter mostly due to the not-too warm gentle breeze from the s5. With overnight building temp turned down to 65F the laser was still in operating range of 73-75 come turn-on in the morning so zero-warm up time needed

pm me a pic of yer circuit. Have you looked at the gate drives with a scope? I'm guessing either the switching times are off or possibly oscillations.

And of course definitely interested in one

A small part of my farm: Ants being nice area heaters around our Trumpf ultrafast laser testbed

1x s5 up top blowing warm air under the laser and 3x s7's under keeping the general area warm.

a simple search turned up http://www.amazon.com/Bitmain-Antminer-S7-fan-OEM/dp/B01D88TURO
I assume the dp means Delta Products and the B01D# is the model.

I have 20 s7's from batch-1 on up all of course running 25x7 and have had zero failures so far. How are the fans failing???

Instead of pasting in the link as a hyperlink, select Insert Image which is the icon on the left of Insert Hyperlink. pasting the link info into that results in


A tip - if possible please crop the image to just the area of interest to speed up loading time on slow connections...

For pumps and tubing check out any local hydroponics store or HomeDepot in the garden section (for fountains). Don't need a lot of flow since yer only keeping the foam wet so I think a very small pump like  http://littlegiant.com/products/hvac/evaporative-cooler-pumps-cp-series/ which can run dry or submersible ones like http://www.lg-outdoor.com/c/hydroponic-circulation-pumps which CANNOT run dry should do nicely. btw: prices on those sites are way over what I usually see the pumps selling for.

I'd assume Hyper is talking about final real estate once some ideas have been tried and weeded through no?

Aside from that, as always seems you do bring up points we can agree on, in this case the necessity of doing more than just sims. Just ask BFL, Cointerra, Bitmine.ch as well as others how well that works (going straight from sims/FPGA work directly onto full silicon with pre-order promised delivered-by date(s)) on the horizon. Despite how the expense looks to accounting and the time required as always abhorrent to MArketing, the need to test ideas with physical silicon cannot be bypassed. Running an assload of smaller (and cheaper) dies gives a chance to test different cell layouts  for several different functions to find best and most cost effective of breed to then start integrating together for proto-round-2.

Just like when using SPICE, one cannot always trust what the models say. It's the minutiae of real-world circuitry that never fails to surprise ya from time to time.

Hypermega: Thank you for a very useful reply to Sidehacks questions vs the snarkasim from 2112. Needing to ask questions about things outside of ones core competency is not a bad thing and should be met with better than Ivory Tower attitude.

The AMT/Bitmine.ch A1 miner fiasco.  http://web.archive.org/web/20140501002030/http://advancedminers.com/bitcoin-mining-hardware/520-ghs-bitcoin-miner/
I got sucked into that because their 512GHs miner had been advertised as 'available in 4 weeks' vs the THs rigs which were pre-order only. We all know how that went: On AMT's end, dozens or more customers out 10's of k$ each from pre-order sales of the THs rigs, very few customers eventually getting anything at all many many month over due. Only the courts know how many direct Bitmine.ch customers were scammed over their A1 Coincraft rigs.

I was one of the lucky few who got anything from AMT, a Dragon clone I think built by LKtek and it arrived 8 month late. At least was a solid 1.1THs rig but still, $4k for it when the S2's had been out for a couple months and the S3's were just coming out... Ran it non-stop  with zero problems until 3 weeks ago when I finally shut it down to free up its 1.5kw to replace with a s7.

https://bitcointalk.org/index.php?topic=1291890.msg14633894#msg14633894
Talk to him about it. He seems to be interested in talking to BitFury or has tried to.

Crypto hit a couple good points on the $13 pricing with the biggest being BF's internal use accounting: Remember, BitFury as a Corp has several divisions, one being building fixed or 'mobile' Peta-farms to whom the chip div will be selling their product. The chip div makes their markup and the farm building div makes theirs as well. Yeah it's sort of robbing Peter to pay Paul but that's how the money shuffle goes to add up to a very nice bottom-line for the parent company.

Again though, if BitFury really intends to support a Community miner project then screw $13. They know it will not be competing with commercial miner sales so at least give us their best high-volume price or even at-cost. Pretty sure they can do a money shuffle to justify it and still come out ahead.

The other point is that these are 1st production run chips so yeah they will sell at a premium as will the 1st commercial miners using them. As to what price for later runs will be, not sure. the new 16/14nm node pricing cannot be compared to the models for the now very mature higher node sizes. With it just now coming online for boutique chips like miner ASIC's I think TSMC and the very few other foundries capable of producing  16/14nm dies are going to be charging all they can get for quite a while. They have several Tier-1 customers to satisfy using all the production capacity they can throw into that. Everyone else pays a premium to get shoehorned into that.

On the s7 chips.... Sorry about the chip package size Spoiler alert: 100um pitch is now out in the wild as well and our customer in Taiwan is asking us to do our bit to take it under 50um

But as to using bare s7 chips... Once Bitmain releases their 16nm miner, think they would be more open to selling the s7 chips? Just how low of J/GHs can they be taken?

Well you are sooo right!. Just checked their site. Dunna know why it stuck in my head they were in the Ukraine. 

Firstly, MarkAz is spot on with all points he mentioned. Kudo's

As to what your setup will do... for a start, depends on where the thermostat is followed by how makeup air is coming in. I believe most Codes now require some sort of provision to prevent high negative pressure in occupied areas but in most cases a 'leaky' building takes care of that

You said 'apartments' did you mean AC for physical apartments (units) are linked together or just the rooms in your apartment? If possible, short-circuit the airflow into the room by opening another window in the room away from the exhaust or a room/area close to the miner room and leave their doors open...

AFAIK so far nothing at all to be heard from BitFury re chips/data sheets for the Community miner project nor anyone else.

Just came across this today https://ics-cert.us-cert.gov/alerts/IR-ALERT-H-16-056-01 while reading up on a feed about US grid security upgrades coming up and wondered if BirFury's farm amd other operations in the Ukraine are in the blacked out regions... The hack on Ukraine's grid was very extensive and targeted If so, no fun at all for them

Do refer to the quick Spec link I posted when you buy the HP PSU's http://www8.hp.com/h20195/v2/GetDocument.aspx?docname=c04111541 as they are made in all 80Plus ranges from Bronze up to Titanium. The price a seller wants is one clue to what the eff rating is if they do not say it outright. Hopefully they give the HP model number for easy reference...

The cheapest I picked up on Amazon was around $25 for one, turns out is Silver rated (was before I found the spec link). Thankfully I was wary of the ones I've seen for $15-20. Most from Amazon running around $30-45 turn out to be be the Golds. You can find Platinum rated ones but they generally start around $75 or higher and they are explicitly advertised as such for easy searching.. Also, if you have the $$$ some Titanium rated HP's show up from time to time. Still cheaper than most same-rated ATX PSU's though.

The HP 1200W supplies really do not need airspace around them, just free space at the ends for air in 'n out eg, part of my farm from 11mo ago, https://i.imgur.com/J4uUYAa.jpg https://i.imgur.com/rbcz0pw.jpg and https://i.imgur.com/OochrCC.jpg

That's 6 of them packed in a 2U high brick. During the summer it gets up to >85f in that area and never had a problem with them. Do they get toasty to the touch? Well yes but that is how they are designed to run 24x7x365. As a rule of thumb I keep max load on any PSU to around 80-85%.

Philipma: If you check that link I gave to the HP supplies on p.15 you'll see that they have 48vdc input supplies (36-72vdc range) and since you are into solar... eliminates substantial inverter losses I'd think.