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We have asked on the website but received no reply.
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Topic: [ANN] Bitfury ASIC sales in EU and Europe - page 106. (Read 250465 times)
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
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?
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.
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.
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:)
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.
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.
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.
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. are there CAD models available for building custom casings?
+1
On a different note (not addressed do you specifically Foofighter):
If anyone is thinking about making custom casing for these with proper cooling (120mm, 140mm, or above fans) I'd be interested in buying two or more.
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?
Whats the dimensions of the hashing board and the master board?
Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Master board is 80x368 mm. Hashing board is 110x139 mm. It's connected using SPI (on the GPIO connector). I don't know about the software. Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Bitfury used to say he doesn't like cgminer for this purposes. He prefers to write custom software.
Hmm, that could be a problem for some of us. What about support? Relying on a custom piece of software that (many of us) will have no clue how to fix when it goes wrong is not a good thing. At least with cgminer or bfgminer there is some limited community support. Also if ckolivas and the cgminer team get their own starter kit they would be able to develop and optimize the software for the hardware. Would it not be better to focus purely on hardware and let someone (like ckolivas and other miner developers) else work on the software (essentially for a free dev board)?
Whats the dimensions of the hashing board and the master board?
Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Master board is 80x368 mm. Hashing board is 110x139 mm. It's connected using SPI (on the GPIO connector). I don't know about the software. Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Bitfury used to say he doesn't like cgminer for this purposes. He prefers to write custom software.
plug and play
Sorry to be PIA but just need to be sure. Those boards (IE 25GH starter kik) are fully operational after arrival or I need to soldier the chips, power regulators etc.
Can I just plug and play them (after initial setup of course...)?
Can I just plug and play them (after initial setup of course...)?
We're still doing full temperature tests. However, for a single hashing card, the dissipation is actually 15-20W, not 40W.
Whats the dimensions of the hashing board and the master board?
Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Master board is 80x368 mm. Hashing board is 110x139 mm. It's connected using SPI (on the GPIO connector). I don't know about the software. Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Thanks. Another question. Has enough testing been done for thermal performance? I understand its to be passively cooled without heatsinks, but would it be stable with 35C ambient with no natural airflow? Id assume that the ~40W of heat would mostly dissipate over the 110x139 mm hashing board, which i think would get pretty warm.
are there CAD models available for building custom casings?
Whats the dimensions of the hashing board and the master board?
Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Master board is 80x368 mm. Hashing board is 110x139 mm. It's connected using SPI (on the GPIO connector). I don't know about the software. Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Whats the dimensions of the hashing board and the master board?
Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Does the master board connect to the RasPi using usb or gpio?
Does the pi run cgminer or some custom miner software?
Why not SEPA transfer to bitstamp.net? UK banks will probably charge for this (as with other SEPA transfers), but only in the way that they would charge for other SEPA transfers I think.
I'm not a financial adviser, please check carefully before doing this!
I'm not a financial adviser, please check carefully before doing this!
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
http://freeimagehosting.nl/site2/image.php?di=8BMQ
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