Topic: Swedish ASIC miner company kncminer.com - page 1690. (Read 3049501 times)

For those wondering what JK is referencing:
http://www.pcpower.com/downloads/EPS12VSpec2_91.pdf

IIRC later version of the spec removed the requirement for multiple 12V rails and with it the max current on the 12V rail.  

Joel, I think what may be unclear Joel is that in the PSU linked above while the PSU has 6 PCIe connectors it puts TWO connectors on one strand of wires. So each pair of PCIe connectors is limited to 22A.  With three pairs of PCIe connectors at least one rail will need to drive TWO PCIE connectors and thus the load on that rail is half of a Jupiter.  To be clear this wouldn't be a problem if a PSU with four PCIe connectors connected each one to a seperate rail but for cost reasons they don't.  If you look at the wiring of all ATX PSU you will find each set of cables has two PCIe connectors in parallel.  So multi-rail PSU are going to be bad news.   

However it isn't quite that bad.  Later versions of the ATX spec removed the requirement for multiple 12V rails and today almost all high end PSU use a single massive (100A+) single 12V rail.  It is cheaper, more efficient, and easier to manage.  However despite all the connectors attaching to the same rail for safety no PSU is stupid enough to allow 100A to flow down one connector.   100 amps is a massive amount of power enough in a short circuit situation to cause a fire or death.  So while technically a PSU can deliver 100A+ on any connector (PSU connector not downstream PC standard connectors) no PSU is allowed to do so.  It is just a lawsuit waiting to happen to design a product than if a short circuit occurs will allow 100A+ to flow to wires and connectors not designed for that kind of current.  All single rail PSU employ over current rotection at the connector level to prevent the full PSU current from unsafely flowing down one connector.  They will trip if "excessive" current is going down one connector.  It might be 20A, 30A, 40A all depends on the design and configuration.  There is no way of just looking at the PSU what the limit might be.  To put it into perspective the PCIe spec only require 150W per 8 pin connector so a set of wire with two PCIE connectors in series "normally" won't pull more than 25A.

Lets imagine a Jupiter pulls 790W (65A @ 12VDC) that means the current at each PCIe connector is 16.25A. No problem there.  However if there are two PCIe connectors on a single "strand" and both are used then the current on the strand is 32.5A.  If the overcurrent protection for the connector is 40A well there is no problem but if it is 30A?

this is what I call a good news (if confirmed)

And for those eagle eyes, yes, it does say "for a Jupiter running at the expected speed of 500 GH/s". That's today's newsflash 

Not to really take this off topic but how can it not suit anybody. its free power. looks like a win win senero on that

The thermal conductivity coefficient is based on the thickness of the material, not the surface area.  That's why it's measured per meter and not per square meter. You have to do calculus to figure out how much energy will be transferred (but in the case of a flat surfaces it's not difficult)

Anyway, you would definitely need to keep oil circulating in order to keep things cool.  And I think anyone dunking a brand new KnC in a vat of oil is pretty stupid.

You should be able to use standard CPU coolers for this so just get some waterblocks if you don't want to go with air cooling.

don't worry bro

quoting the relevant part:


so in march we will have 15.5 PH/s, that implies more or less 2 billion diff.
i've quickly input those data into http://www.bitcoinx.com/profit/ using 2.1billion difficulty and guess... what you'll mine  0.0958 BTC per day @400GH/s.

it's not that bad at current values that means almost 360 USD.

I know you should have taken into account pool fee and electricity cost but I left it as exercise to the readers

and as last point, hopefully by march you already get back our initial investment
 

It just needs to be properly planned and executed. The wicking is easily overcome by gravity and wick stops. Usually stuff you plan to submerge, you don't plan to bring out unless it fails. You can get it in bulk, like $2 a gallon or something, even less in some places. As for flow, inexpensive aquarium powerheads do the trick with ease. Mineral oil, and variant oils, are used in high end server racks all over the world. Just needs to be done well.



It still needs a method of transfer. Air bubbles, generous surface movement, fans blowing on the glass, heat exchanger such as  radiator/etc. Otherwise with units like these, it'll cook itself. Without it, the heat doesn't dissipate, it collects in the bath. You can put a mild CPU (think single, maybe dual core, few years old) in there, but that's it. Not ASIC chips. You'd need a generous thermal exchange plan.

Oil is great if you plan it out. Super quiet and neat, and easier than watercooling systems (when dealing in bulk large pieces of equipment like this). For just a few chips I might consider water cooling. If I was serous about something other than air cooling for many units, I'd just design a simple submerge tank for oil.

I've always wanted to do a mineral-oil to salt water pool cooling datacenter hahaha. I have a 45,000 gallon pool which can easily be used to absorb heat from some racks, just need to have the oil heat exchanger inside of a closed circuit of the pool's system. Plenty of thermal capacity, and it'll warm the pool up for the crisp winter use.

so in march we will have 15.5 PH/s, that implies more or less 2 billion diff.
i've quickly input those data into http://www.bitcoinx.com/profit/ using 2.1billion difficulty and guess... what you'll mine  0.0958 BTC per day @400GH/s.

it's not that bad at current values that means almost 360 USD.

how does this affect possible roi for day 1 delivery ?

is this worst case or just probable ?

https://bitcointalksearch.org/topic/estimate-of-asic-pre-orders-13-to-15-phs-diff-18b-to-21b-by-end-of-2013-283820

brings tears to your eyes...  

Presales Total 2013:        6,281 Thash
Announced Total 2013:       1,750 Thash
Running Total 2014:         7,380 Thash
--------------------------------------------------------------
Combined Total:            15,411 Thash

1 TH/s = 0.14 mil difficulty
1 PH/s = 140 mil difficulty
1 million difficulty = 7 TH/s
1 billion difficulty = 7 PH/s
1 trillion difficulty = 7 EH/s

Hi @KNC, out of first thousand miners you make, may I know, how many of them you,

1. keep to yourself?
2. host for others?
3. ship for others?

Am I asking too much?

It just says paid... That dont tell me much. Let alone when it will be shipped...

You can take your order number from your My Orders page and paste it into the order tracking search box on the main page to see when your miner is going to ship.

Did the specs change recently on the Saturn or Jupiter? I could have sworn I was getting 400 GH/s but my Jupiter says it is a 200. Has it always been a 200?

Also from KNC's website in the product description it says won't ship until mid November. I thought these were suppose to ship in September unless that means if you order now.

Over 400 pages to read here and now they have their own forum gets crazy. That's exactly what BFL did. Instead of coming here they opened up their own forum. Similar minds think alike?