[ANN] Bitfury ASIC sales in EU and Europe

[allinvain]

I'm also wondering if it would be ok to attach a small heatsink to each chip (with those thermal pads with glue on them - like VGA and north/southbridge coolers)? Would this help with cooling or is most of the heat dissipated through the PCB itself?

The chips are quite small, and dissipate most of their heat through the big ground/thermal pad on the bottom, and plenty of vias spread that heat effectively through the PCB. If you want to attach a heat sink, it's best done at the back side of the PCB, which has been left free of components in the main ASIC area. Six mounting holes in the PCB could be used for screws, or you could use an adhesive type.

Excellent. Thanks for the info! That's what I shall do (attach a heatsink on the back). As to what size and type I'll have to see. I'm thinking something like this might be perfect: http://www.newegg.com/Product/Product.aspx?Item=N82E16835708009

But when you say the main ASIC area has been left free of components you mean the center of the PCB and on the outside area there are various leads and components, no?

I'm also wondering what you think is the recommended spacing between hashing boards. Given that each board only produces 20 to 40 W of heat it should be theoretically ok to have the hashing boards spaced together tightly.

I don't think this is mentioned anywhere but are there any temp sensors on the boards? And if so I assume it will be visible in the mining software.

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[cscape]

If you look at the board here: http://www.bitfurystrikesback.com/product/bitfury-55nm-asic-h-board/, you'll see a main area with the 16 ASICs, and a strip at the bottom with the edge connector and power regulator. On the other side of the board, there are a handful of small components underneath the power regulator. There are no components underneath the square 110x110 mm ASIC area.

The spacing between the boards depends mostly on your cooling arrangement. The closer they are, the harder it will be to get sufficient airflow. I think 20 mm is a good lower limit. The thickness of the components sets an absolute limit of about 10 mm (excluding heat sinks), but it will be challenging to get the heat out.

There is no temperature sensor on the boards.

[intron]

But when you say the main ASIC area has been left free of components you mean the center of the PCB and on the outside area there are various leads and components, no?

I don't think this is mentioned anywhere but are there any temp sensors on the boards? And if so I assume it will be visible in the mining software.

Please have a look at the layout of the bottom layer,
you can see the distance between the screw holes
and the area that has components placed.



intron

PS: You are looking thru the board from the top side.
Don't make the 'mirror error' too often made:)

[allinvain]

If you look at the board here: http://www.bitfurystrikesback.com/product/bitfury-55nm-asic-h-board/, you'll see a main area with the 16 ASICs, and a strip at the bottom with the edge connector and power regulator. On the other side of the board, there are a handful of small components underneath the power regulator. There are no components underneath the square 110x110 mm ASIC area.

The spacing between the boards depends mostly on your cooling arrangement. The closer they are, the harder it will be to get sufficient airflow. I think 20 mm is a good lower limit. The thickness of the components sets an absolute limit of about 10 mm (excluding heat sinks), but it will be challenging to get the heat out.

There is no temperature sensor on the boards.

20mm seems like a very reasonable recommendation. I'll probably end up doing 35 to 40mm spacing (not including heatsinks). As for temperatures, I guess I'll have to use an IR temp sensor (the temp "guns") or maybe attach some temperature probes to the back of the PCB. But with enough airflow everything should be alright.

[allinvain]

But when you say the main ASIC area has been left free of components you mean the center of the PCB and on the outside area there are various leads and components, no?

I don't think this is mentioned anywhere but are there any temp sensors on the boards? And if so I assume it will be visible in the mining software.

Please have a look at the layout of the bottom layer,
you can see the distance between the screw holes
and the area that has components placed.

http://imgur.com/gUMVK0b

intron

PS: You are looking thru the board from the top side.
Don't make the 'mirror error' too often made:)

Thank you intron. That image was actually very helpful!

For your own 100TH operation how do you intend to mount the h-boards?

[intron]

For your own 100TH operation how do you intend to mount the h-boards?

I'm not doing the 100TH, just made the prototypes.

intron

[blackarrow]

Hello!

We have asked on the website but received no reply.

Can we know who is the company behind this website? We would be happy to place an order but sending 45000 euro anonymously looks very dodgy.
Do you accept bank transfers?

[rammy2k2]

any plans to add CC option too ? i see US customer have it 

[zyyz]

Hello!

We have asked on the website but received no reply.

Can we know who is the company behind this website? We would be happy to place an order but sending 45000 euro anonymously looks very dodgy.
Do you accept bank transfers?

Here the same.

Need to use Banktransfer. To make the buy legit to the Tax authority.

if the take VAT , they have to make invoices. And for that they need a VAT number.

So they should  get a bank account for they Company.

Very dubious.

[jelin1984]

hello does anyone accept the vat code
because i can not put my vat number at the site

[zyyz]

hello does anyone accept the vat code
because i can not put my vat number at the site

yes it works for me.

try without countrycode and blank keys

[jelin1984]

which is blank keys?

[Foofighter]

But when you say the main ASIC area has been left free of components you mean the center of the PCB and on the outside area there are various leads and components, no?

I don't think this is mentioned anywhere but are there any temp sensors on the boards? And if so I assume it will be visible in the mining software.

Please have a look at the layout of the bottom layer,
you can see the distance between the screw holes
and the area that has components placed.

http://imgur.com/gUMVK0b

intron

PS: You are looking thru the board from the top side.
Don't make the 'mirror error' too often made:)

Hi intron,

have you also got a pic of the master board, would be great to see this too.

thanks

regards

[yohan]

Not so good...

why not use - if you are not US citizen - UK based www.skrill.com and www.btc-e.com thru with www.lr2wm.com ?

I don't see the option to exchange from Skrill to BTC-E.

i'm not adviser, please contact https://btc-e.com/setlocale/en support AND www.lr2wm.com support - check the www.lr2wm.com/reg.php?lang2=english
i suppose btc-e support will give you the best advice possible... can transfer GBP to btc-e USD account - see screenshot below

15% commission does not seem like a good deal to me other than for the dealer. Point is it is daft to go to BTC from flat for that only to be put back to flat by the seller especially on larger amounts. Like it or not chips still have to paid for in flat currency and until that changes artifical expensive use of BTC isn't really a benefit.

[joris]

Need to use Banktransfer. To make the buy legit to the Tax authority.

Tax authorities differ from country to country, but in NL, barter with a business has to be accompanied with an invoice, which is a document with a legal status. The way you pay, doesn't matter, but has to be of equal value expressed in EUR.

VAT depends on trade value (invoice), type of product or service, sector of the economy and purchaser.

BTC are regarded here as tokens in LETS (Local Exchange Trade Systems) and their fiscal value is the purchase value, whether by fiat or barter.

So you have anything exchanged of EUR value for BTC which you exchanged for EUR value. So you have a realised profit-loss in/out of BTC, since they have a different purchase and final exchange value, and the cost stated on the invoice of Bitfurystrikesback.com.

So the value you spent on the BTC you spend on f.e. a € 1.000 miner, is your net business cost for the miner (excl. time spent on your EUR<->BTC administration)

[cscape]

Here's a picture of the master board:

[Foofighter]

Here's a picture of the master board:

thanks a lot cscape, so the H boards are directly put into the master board is that right?, so the distance between the h boards is already defined by the distances which the master boards provide?

EDIT: sorry just have seen that you answered this already:

It's connected using SPI (on the GPIO connector).

Is it possible to get the bore hole distances from the master board too please?

[cscape]

thanks a lot cscape, so the H boards are directly put into the master board is that right?, so the distance between the h boards is already defined by the distances which the master boards provide?

Yes, they plug in directly. And yes, if you buy the master board together with the h-cards, the distance between the cards is fixed at 20 mm. Also, the SPI bus goes in one card, through all the chips, and then out on the other side, into the next card. So, if you get a master board with only 8 h-cards, you must use slots 0-7.  You can't skip slots, because it would break the SPI chain. Of course, if you're not afraid of soldering, you could put some jumper wires across the unused connectors, or make some dummy PCB edge connectors that connect inputs to outputs and stick those in unused slots.

[salvi]

@punin:
Will I receive an invoice, when I buy using VAT EU?

[turtle83]

thanks a lot cscape, so the H boards are directly put into the master board is that right?, so the distance between the h boards is already defined by the distances which the master boards provide?

Yes, they plug in directly. And yes, if you buy the master board together with the h-cards, the distance between the cards is fixed at 20 mm. Also, the SPI bus goes in one card, through all the chips, and then out on the other side, into the next card. So, if you get a master board with only 8 h-cards, you must use slots 0-7.  You can't skip slots, because it would break the SPI chain. Of course, if you're not afraid of soldering, you could put some jumper wires across the unused connectors, or make some dummy PCB edge connectors that connect inputs to outputs and stick those in unused slots.

Does this mean if one chip is fried (or removed, ) everything beyond that would fail?

What happens if i unsodder last chip of the last board to play with? Would everything else continue working or it requires a bit more hacking to get rest of the stuff to work?