And it's a nice FAT one ta'boot.
Also, after 25hrs of being off line my main farm is back up to full speed again

Actually your example should be 1W=1V*1A but yes 6.25A @ 240V. @208v the draw is 7.21A -- Always find what the minimum voltage to the area is and use that for sizing the service needed.

As mentioned elsewhere; 'pay for an electrician to look and give you a quote'? Um, find a different electrician/company! One does NOT pay for getting an initial estimate. Even if significant engineering is involved for changing/upgrading service there should still be no charge until you accept their proposal to do the work.

You referring to https://bitmainwarranty.com ? Unless they recently changed, they are PAID repairs only. While connected with Bitmain they are NOT part of Bitmain and do not do warranty repair for them in the US. Has that changed very recently?

As for the T9 - one word: Reliability. As in near-zero complaints/problems.
Yes I like the slightly better eff/speed most s9's have but am also very willing to pay for better reliability. Been buying Avalon's as well for the very same reason.

heh heh... my phone is a - phone. https://www.pricefalls.com/product/lg-vn250-cosmos-black-verizon-cellular-phone/83920764?source=GoogleShopping&medium=cpc&term=&content=PLA&campaign=766797740&gclid=COb--_LV5tMCFUW5wAodh5EBkQ&ad=184104725903
Don't have a data plan, never needed one. (until now of course)

Sure -- rub it in... 

Our ISP says that a major fiber trunk was cut in the Detroit area causing the outage to their service. Um, no backbone backup to cover this and route around the break???

Ja. I powered down all the Bitmain gear because being Bitmain they were all still running pretty toasty.
The Avalons however - they still report as alive, just throttled down to a standby mode. As in cool air exiting them so I left them alive. Nice touch there and hopefully once the RiPi can talk to the 'net hopefully they will automajickally restart.

Grumble grumble....
The internet/phones at work have been down since 10:30 this morning so main farm is off line    Was holding a steady 233THs, just looked and still just the 37.4 here at home reporting....
Narf

Go to the main thread for the 2Pac https://bitcointalk.org/index.php?topic=1764803.0
All you questions are answered there, most in the first post.

Been over a year since last had a board repaired, was $140 as I recall.
Register with them and ask. https://bitmainwarranty.com

For shipping to them, If you are in the USA, use the USPS's 1-price boxes. Including full insurance for $450 replacement value it cost $14.95 to ship a board to them.

I wouldn't say 'never' on the R4 but yes it is a real roll of the dice. I have 3 of them. 2 perfect and near silent, the 3rd lost the top board after 24hrs. Gotta send that to Colorado some time now that warmer weather is here...

Ya, the s7-LN especially with sidehack's UV/UC mod are exceptionally quiet. Also only pull around 750-950w depending on how you set them up, db level is commensurate with speed/power.

eep
The only possible thing to try would be to get a couple cans of electrical contact cleaner or circuit board cleaner and hose them down to *maybe* dislodge crud. Problem is, if the boards are very old and most likely covered in fine dust then flooding them COULD MAKE THINGS WORSE if they are not pristine when done. You could very well force dirt into places it wasn't before.

And no, no how-to's beyond 'Does the red LED power lights on the board turn on?' and perhaps swapping the data cables around just to make sure it is the board(s).

BitmainWarranty in CO pretty much prefers folks don't try to fix boards themselves. I can imagine what some look like after folks ham-handedly try...

Speaking of which, had a s9 batch-13 board fail yesterday so time to send it to them.

***  Foxminers LLC is a SCAM! If someone buys their miners without a well-known and trusted Forum User 1st getting one for doing a review and posting it here then well, you have been warned ***Since sorta walking down memory lane but at least keeping this SCAM thread at the top for the perps to fret over, what the heck. If it costs them losing even 1 sale it is worth it. There. It's on-topic again

2112 you hit on soooo many good points. If you catch my other posts in other threads ya may have noticed I take the 'Teach a person to fish' approach to answering questions. LEARN folks! Don't just raise yer hand to get one specific answer, learn the why and ta-dum! things start to connect..

Again my profession isn't CS, since 1977 it has been design/application of industrial lasers. To me computers are just tools. Und damn we have come a long way from paper tape NC controls with literally relay based ladder logic...

The how/why knowledge of semiconductors themselves well, as a kid in late 50's was building vacuum tube toys and literally grew up tinkering with discrete transistors ect,, led to enlisting in the Air Force (dinna want to be drafted so choosing a service best option) > long haul microwave, ended up in the 1839 E&I Group out of Keesler AFB installing the gear for com sites- I tell ya, a tropo site is something to behold. Also most often on a tiny island in the middle of nowhere... https://en.wikipedia.org/wiki/Tropospheric_scatter No large use of satellites back then. While in the military, got BS EE for the heck of it.

Out of the military -- moved up the spectrum into lasers and been there ever since. Only burnout was 2 years of 80hr weeks doing field service at my 1st company Photon Sources (now Lumonics). My instant 'In" with them was the multi-kw microwave power background and um, I had build a dye laser in Jr. high school. Another engineer there was tired of it as well so we started SLI http://www.synchronlaser.com/ and will be there until I die. When you love what you do it isn't work!

The laser biz is my link to wassup in the chip manufacturing world and a helluva lot of other industries. Pure how to make things. Comes with the turf: With bleeding-edge products intended to leapfrog how-things-are-done-today, the customer does not exactly know what they need for producing them, only what they want to produce. Guess who gets to figure out how to do it since no no one else has yet done it outside of a lab... 1st step - understanding to the nth detail what they make that requires - unique solutions -- vs off-the shelf so I can have a handle on how my systems may affect the desired result. For power chips it may only be an interposer/heat spreader but the dies care a great deal about their interface to it so understanding their construction is mandatory.

Damn this thread goes a'wandering...

Sigh. Look at the Bitmain specs maybe?.....
Nice round ball park is 1,500w per-s9. Will need 208-240 volts and with that voltage the amps per-miner =  1500/voltage.
Your turn.

And that ^^ being right to the main point of why no 'new' way to hash faster is going to be seen soon is why I deferred to 2112. Only so many ways to skin a cat in hardware when it serves one and only one purpose.

I am not involved in the architecture design and strictly follow the node-size tech eg physical construction of the gates vs implementing actual circuits to explains 'why's' as part of the voodoo I do. My part comes in making it possible to efficiently pull the heat from the dies, Specifically making the systems that micro-machine vias into ceramic interposer/heat spreaders the dies get attached to as part of their packaging to become 'chips'.

Sure you can shrink gate sizes to pack more gates in. CPU, phone baseband chips, network fabric switches and such have the luxury of a bigger physical die size footprint to accommodate the plethora of connections also resulting in lower power-density from more area to spread out the heat/attach heat sink or other thermal route to. Mining ASICS -- sure can fit in more cores but methinks they are already at the point of diminishing return for packing density vs power needed to feed the die. That is why these are so bloody hot. With the BM1387 chips reporting die temps of 95C to 110C as 'normal, God knows what the real junction temps are.

Which pools? Hard proof or at least quotable suspicious actions by them leading to this theory?

Cute: Looks like an old s1 without the RiPi on it
Don't know if you caught the edit I did: As far as 7nm goes, this is that last I have come across https://arstechnica.co.uk/gadgets/2015/07/ibm-unveils-industrys-first-7nm-chip-moving-beyond-silicon/ Do note that 'chip' is referring to an assemblage of functional test structures - not a usable logic chip. Again, is a couple years old but things have been very quiet in terms of news released by the Foundries.

Has several good links in it to other articles about wassusp

That is a lot harder question than you may think as there are several layers to it... For one, no one else has anything approaching what they claim. The world of crypto ASIC design is very very small and frankly no one does anything without the others working along the same lines and being rather vocal about it. Since when it comes to the Next Wonder Miner all we hear from real makers is crickets, well....

On the physical construction and layout of an ASIC I have to defer to a member here with the handle 2112 who is/was an instructor in chip design. You might want to PM them about it. A couple papers on 16/14nm tech http://www.techdesignforums.com/practice/guides/14nm-16nm-processes/ and from 2013 http://www.eetimes.com/document.asp?doc_id=1280773 Somewhere I have several papers from Mentor Graphics on their toolchains for those nodes...

As far as 7nm goes, this is that last I have come across https://arstechnica.co.uk/gadgets/2015/07/ibm-unveils-industrys-first-7nm-chip-moving-beyond-silicon/ Do note that 'chip' is referring to an assemblage of functional test structures - not a usable logic chip.

To me the core <yes, pun> issue is, how many cores will fit in a chip? Unlike CPU's, crypto ASICS are extremely simple beasts. Each has serial coms, a smattering of working memory, and a buttload of hard-wired SHA logic cores. Whereas a CPU contains many different circuits for several kinds of IO, along with cache and math, together with the actual few to handful of CPU cores. The latest Intel Xeon has what, 12 physical cores in it? As I recall, Bitmains BM1387 chip used in the R4, s9 and T9 have 250 cores in them, the s9 uses 189 of those chips. In a way GPU chips are similar (high core count) but rather like FPGA their operations can be changed via programming but that ability again leads to speed and power penalties.

Since Bitmain has not released a data sheet for that chip, here is the specs for their last 28nm chip used in the S7 miner https://shop.bitmain.com/files/download/BM1385_Datasheet_v2.0.pdf to poke through. Much of it should still apply to their current 16nm chip

That simplicity does have a down side: Power density. Miner design moved away from large monolithic chips because it is very difficult to power and cool a chip which size-wise *could* these days hold several thousand cores and dissipate >1,000 watts. The BFL Monarch, Hashfast Minion, and a few other failures come to mind...

On the software end, it becomes fuzzier. There 2 things come into play, Stratum which works with the pools to create work and the miner software itself. Stratum docs https://bitcointalk.org/index.php?topic=557866.0

For the miner software, talk to -ck since he wrote cgminer which is what almost all miners use. Considering even the latest miners can run on a single RasPi-3 front-end that rather says then and there that optimizing code (even more as it *is* rather mature) will have little impact.

As for the Samsung 10nm processor: Read into the link and the one from Intel. To claim the 1st-to-market moniker the Samsung is kind of a cheater: Yes the gates are around 10nm but the metalization (connections) are the same 22nm they use with their 14nm chips. Intel tends to shoot for doing the entire process smaller - not just the gates.

*Could* Bitmain be working with TSMC to make a 12nm mining ASIC? (With the same 22nm metal layers they use in their 16nm FinFET's). Sure. When it comes to boutique chips like mining ASICS Bitmain is the one company that certainly has resources to pay for it. But makes no economic sense to me for them to do it: Their BM1387 is king of the hill with no competitors and after the beating the entire industry took finally getting 16/14nm to the consumer market coupled with the still-erratic chip-to-chip performance headaches they (and Avalon, and BitFury) have to deal with there is just-no-point to do it at this time. Even if they did, there is still the problem of boutique chips being last in line for the Foundry production priorities. Just as is still the case with 16nm chips first come the folks who financed ALL of the research involved eg, Apple, AMD, Cisco, Broadcom, et al.

Or refer to here [General] Bitcoin Wallets - Which, what, why?
 for a list of all types, advantages/disadvantages...

That ^^ and more to the point, in the altcoin sections there are scads of people who run the systems needed for alt's so that is the best place to get your answers. Here, it is BTC rigs only.

Just noticed this https://bitcointalk.org/index.php?board=39.0 I never knew that the Forum had a Beginners area! Given that, the Forum registration process should point folks to the Sticky there https://bitcointalk.org/index.php?topic=1689727.0 when they finish registering. Might save a lot of wrong-section annoyances...  

When done by the OP (Original Poster) it is because the topic has been fully answered and discussed to death.
More often threads are locked by the Moderators and that is usually because it is seriously off-topic or in the wrong section.