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1341
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Bitcoin / Hardware / Re: [ANN] Bitfury is looking for alpha-testers of first chips! FREE MONEY HERE!
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on: September 10, 2013, 12:22:56 AM
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Lol... the shopping list is getting longer... those sparkfun guys are going to love me.
The advice/recommendations are very much appreciated.
Hehe since your pictures are good if you wouldn't mind showing what this looks like after you have cut the traces and soldered anything that would be cool. Just in case I need to do this in the future id like to see how its actually done. See also this example: (source: https://bitcointalk.org/index.php?topic=250249.msg3099241#msg3099241)  (although that is a bit of a overkill) In essence - make a narrow cut (1mm) just enough so that you can visually tell that the traces have been cut apart and that should do it. It is also a good idea to keep the cut relatively small - in case it turns out that this is the wrong chip  (yes - believe me - Murphy's laws were not invented out of boredom!) Be careful as once you cut the traces it would be relatively easy to grab an end and just peel the entire trace off. That's fine if you're sure you'll never ever need it again (but are you?) You can also use a small piece of wire (any wire will do) to connect the points. Or make a large slump of solder and bridge them that way. I'd go with a wire though - much easier. Sorry guys, idle board was money lost so did a quick fix trace cut. Any good tips on how to desolder the chip? looks like it's soldered to the board with the ground pad. I have a 50W Weller soldering station. Is it possible to easily desolder with a soldering iron or do I need hot air tools? |
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1345
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Bitcoin / Mining support / Re: [GUIDE] BitFury Miner Support/Tuning
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on: September 09, 2013, 05:35:34 AM
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Is there any guide/manual to make chainminer display more values?? I was hoping it displayed a full set of values: accepted, rejected, difficulty, etc, etc, just like cgminer or bfgminer but chainminer is extremely shy and doesn't provide nearly the same feedback when running manually.
Similary, is there any guide on how to set up/optimize stratum? I heard someone changed the real target parameter or something like that to achieve better results.
you can check difficulty by >sudo su >screen -ls >screen -r <pid> It should show the difficulty reported by stratum proxy |
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1349
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Economy / Auctions / Bitfury Mboard+rbpi+SDcard+PCIE cables; 0.0 GH/s
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on: September 09, 2013, 03:20:35 AM
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I have an extra Mboard, raspberry Pi, SD card with chainminer, and PCIE cables. You need to insert your own H-boards to make it hash.
Shipping from USA to USA.
Bidding starts from 5.0BTC. Buy it now 8.0BTC. Any bids below an amount of 5.0BTC will not be considered and rejected.
Shipping includes USPS priority mail flat rate. Additional fee for faster shipping, express mail is 1.0BTC.
[img ]https://i.imgur.com/gIK6Mem.jpg[/img]
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1350
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Economy / Service Announcements / Re: [ANN] Bitfury ASIC sales in EU and Europe
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on: September 09, 2013, 02:11:19 AM
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Thanks guys for the advice.
As stated in the U.S. thread, I am going to try to reflow these chips first, and see if that gets me over the hump.
Anyone know the flow temperature of the solder used on the H-Boards? (Probably a question for the "free money" thread).
My advice is against reflowing if it passes visual tests  |
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1352
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Economy / Service Announcements / Re: [ANN] Bitfury ASIC sales in EU and Europe
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on: September 08, 2013, 11:45:29 PM
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Hey Guys, I am an american who bought a starter kit from megabigpower. To get my 25 GH, I received a card that is functioning at full capacity (~19GH) and an "EOL" end of line card with is running about 6 to 10 GH. After looking at the stats.log, it appears that the EOL card is only seeing the first 6 chips. I took some macro hi-res pictures of the chips 6 and 7 (45 and 46 labelled on the card), where the spi communication I am guessing is broken. https://i.imgur.com/Iddp2WQ.jpg https://i.imgur.com/MpXXHdS.jpg For the life of me, I don't see anything out of the ordinary. The european thread seems more advanced at getting full speed out of these boards and was wondering if any experienced eyes see something suspicious. Really good macro capture there. I had to cut traces, when soldering the jumpers did not work. |
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1353
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Bitcoin / Hardware / Re: [ANN] US/North American Bitfury sales now open ***full prototype pics***
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on: September 08, 2013, 02:36:54 PM
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Looks like all OCT h-boards are gone now. Glad I ordered more earlier. Maybe because of demand they can direct more of them towards Dave. I got more H-boards to sell in October! Dave, where are you on the balance of Aug Deliveries? Will you be replacing the v1 M boards with the v2 M boards? BUMP! I would like an answer to my question. I think the mining software for the boards are different. I saw two chain miner versions in the sdcard, one for each version of m board. |
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1354
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Bitcoin / Mining support / Re: **US** BitFury Setup Guide
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on: September 08, 2013, 03:33:01 AM
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BTW my hashrates on the pool (Eclipse MC) fluctuates a bit too much with Bitfury. The hashrates on the pool is relatively more stable with my Avalon and BFL Jallys. Any idea if this is a good fix? After removing the -rt (or --real-target) flag from my stratum proxy, this hasn't happened again. This change results in a slightly higher load on the Raspberry Pi that's controlling the ASIC (because the miner now tries to send every diff1 share to the proxy), so I'm not recommending anyone to do this unless you are actually experiencing the above problem. Any pointers to which file needs to be modifiedFound the shell script /opt/bitfury/start-stratumproxy.sh
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1355
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Bitcoin / Mining support / Re: **US** BitFury Setup Guide
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on: September 08, 2013, 03:28:47 AM
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have a board with only first 4 chips hashing. I think the chips start from bottom left corner and go vertically up (U40, U41, U42, U43) down (U44, U45, U46, U47) ,..., then down the second column and then up, etc. Any tips on how to make the board fully functional. It's okay if chip 5 will not hash.
Okay problem solved. Inferring that the problem chips be disabled as per cscape's suggestion I cut the SPI traces of 4th and 5th chips using a knife and shorted the jumpers using thin copper wire. Here are the results. The board now uses 14chips for hashing. https://i.imgur.com/v3HhER8.jpgI fixed an EOL board by shorting the solder jumpers. no need to cut the traces. Funny, my EOL board with disabled chip is hashing at 25GH/s How were you able to tell which chips were bad? Where's the reference to how to fix the problem? Thanks. The number of chips that chainminer detects stops at a certain number. that is the last good chip. solder the SJ pads next to the first bad chip (these are the pads connected via traces from the chips).
BTW what was the initial hashrate of your EOL board?
It was around 15GH/s before. looks like you 'destroyed' the connections for 2 chips in your board between chip and resistor set. Is that the effective way to disable the chip? Does it still take power when the board hashes? After removing the SPI connections and clock, the chips were cool to the touch on the running H-board. |
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1358
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Bitcoin / Mining support / Re: [GUIDE] BitFury Miner Support/Tuning
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on: September 07, 2013, 08:33:33 PM
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Any word on the error rate, I managed to get to 30-33Ghs for short periods and huge error rates, with 0 (zero) actual gains.
How did you look for the error rates? can it be calculated from .stat.log? |
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1360
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Bitcoin / Hardware / Re: [ANN] US/North American Bitfury sales now open ***full prototype pics***
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on: September 07, 2013, 07:30:51 PM
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Looks like all OCT h-boards are gone now. Glad I ordered more earlier. Maybe because of demand they can direct more of them towards Dave. I got more H-boards to sell in October! Haha stock's replenished , any chance of discounts on H-Boards or can you throw in some EOL boards with the order? Those are good fun to work with:) |
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