Right now, I'm waiting for my PCBs for the Avalon miner. In the meantime, I thought I can try to make a board for BFL ASICs, too. So, I sat down and played around with my CAD software. Delivery not certain. Better to work on a BitFury design as that is more in line with Avalon chips right? Same footprint. Yep, you're right. Bitfury has the same footprint as Avalon chips. And bitfury chips have higher throughput with lower power consumption than the BFL chips. With Bitfury it could be possible to make an USB powered miner with more then a 1GHs/s (the specs are specifying a hashrate of 5GHs/s with only 2.5W power consumption). That be good... I don't think there are any BitFury USB designs right? - this the board that got 2.7 GH/s I think somewhere he posted the design, unsure. You need to mine that thread for info. if its not usb, then i think its easy to adapt to usb. |
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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? |
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2 questions when running under linux.
1. Is there a kill signal to stop cgminer gracefully?
2. If i run cgminer with a config file, does sending the "restart" command via the API make cgminer re-read the config file if its been edited by hand before restarting?
Edit:-
just figured out answer to 1 myself. A normal kill on cgminer pid made it stop gracefully.
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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. 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. |
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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?
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Question Re: 25GH Miner Starter Kit
Isint each chip 5 GH/s ? Then how is using 16 chips? Last time i checked 16 * 5 = 80 .
Are these 1.56 GH/s chips or that the chip count info on the page is wrong?
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If you buy something from BFL, you can't be sure you will even be able to request a refund.
How does Avalon's no-refund-for-any-reason make them better than BFLs no-refund policy? Exactly. If manufacturer defaults... in a group the only thing you have is the false assurance that "its not just me"... |
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I would go with a AVALON group buy with escrow option, if I were you.
That way you are covered in case AVALON doesn't deliver.
No you arent covered from avalon's non-delivery. The escrow group buys typically covers you from. 1. Group operator not placing order with avalon and running away with the funds. 2. Group operator not shipping you the stuff once avalon sends it. For this, the only collateral placed in escrow is the operators identity.. Then you must find your own ways to get your coin back. Escrow only collects the coins for the buy, and sends it to avalon... |
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stalking
Thanks a lot for your profound insight on the topic. I learned a lot today. Please keep these helpful comments coming. |
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Whats the thickness of the base?
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How about using metal tank instead of plastic/fiber glass?
I would think thermal conductivity would help in such setup...
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Is there any risk from using open loop system running tap water in such systems? i.e. corossion, mineral deposits, etc?
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Very nice, I want like to test a set up like that but I think for me is easier for me run on air. I have a balcony about the same size with nice insulation, for aditional 800watts(the chiller) I could just put the air conditioner there and run two or three avalons@350 below 51 degrees. But there is the noise.
If we build more blocks how cheap they can get?
The price of the block really depends on the number you order. For orders <100 piece you will not be able to get much below the 150$ I mentioned. If you change the design a little (thinner, less material) and open the tolerances you might be able to approach 50$/piece for large orders. The chiller (800W) is not always running... when it is it makes noise like the outside part of an air condition unit. What temperature do you chill down the water to? Would running ambient temp water suffice if its open loop? Instead of going thinner, you could mount 2 modules to single sink... |
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There has been so much FUD popping up on this site since April that its becoming another BTC-E trollbox. Threads get derailed more than built on. And its sad. Eternal september for bitcoin talk.  ASICMINER on gox? |
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I'm very interested. Also, I swear that the raspberry pi is 5w and that runs off usb without any issue. I might be wrong.
Yes you are. http://en.wikipedia.org/wiki/Raspberry_Pi#SpecificationsPower ratings: 700 mA (3.5 W) I think thats the max power it can draw, probably accounting for USB devices drawing ~100ma per port. |
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Whats the lead time if I don't send you the chips?
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Distilled at 200C smell removed... according to the article. Coconut oil contains odor and tasting compounds, which are actually
low boiling compounds. Inclusion of such compounds with low boiling point
builds a pressure in the transformer at operation where the temperature rises
normally above 60°C. Deodorization removes odor and taste of coconut oil and
is done by steam distillation at 200°C.
To remove saponificable matter and colorings in coconut oil, a
bleaching process was carried out by using activated clay. Sounds like a good solution then... provided you can distill it properly... and limit usage to tropical climate... if the ambient temp is 15C or so, and your rig is shut down for a day or so.. the coconut oil will start greasing up inside the radiators, tubes, etc... Shouldnt be an issue for indonesia... |
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You mean you can't remove parts (de-solder) and then re-flow a PCB after being in oil? In case you want to replace a blown QFN chip. Thanks! Nice info on the heat gun and drip tray thanks. Be picking your brain more and more. Need to have a catch tray and rack will think about some sort of caddying on wheels for this. What about palm or coconut oil? We have bulk amount here in Indonesia wondering if that would be possible? Confirmed and Tested. http://www.elect.mrt.ac.lk/Coconut_oil_eru_2001.pdfConsidering all the above facts, we can conclude that coconut oil can be
used as transformer oil. However further tests need to be done under actual
operating conditions. Coconut oil is freely available in Sri Lanka and it may
become cheaper than other transformer oil. Most importantly it is 100%
environmental friendly, hence it can be easily used as an alternative to
traditional transformer oil. But be prepared for the smell  |
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But... 17.0 W/mK vs 3.2W/mK ... If i had 400 chips to use up 1 expensive sheet (and all the time in the world), id put the expensive one just under the vias, use the cheap sheet (with holes) for rest of the board. |
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16-Port Hub: Up to 16 hubs are provided for USB connection like printer, digital camera, card reader, MP3 player etc Fully compliant with USB 2.0 specification Backward compatible with USB 1.1 Input: 100-240V AC, 50/60Hz, 0.5A Output: 5V DC, 3A, 15W Dimension: 169 x 118 x 38mm (approx.) Weight: 310g Package Contents: Industrial USB 16-Port Hub USB Cable Universal AC adapter again 5v...... cannot run more than 8..... the anker is the best ^ Looks like it has 2 DC input ports. Additional: AC adapter US$10.00 Makes me think that you can use 2 5V/3A adapters to get 6A meaning it can run atleast 12 most likely 16. yes you would most likely need an additional power adapter to get the hub fully powered. oh boy! fap fap fap 4.5A @20V = 90W |
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