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1046
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Economy / Speculation / Re: 20 articles on 'Bitcoin is broken', researchers warn' doesn;t move price? why?
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on: November 07, 2013, 04:33:46 AM
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This time's rally is driven by Chinese, and whoever spread the FUD this time was a bit too western centric and it didn't manage to spread the FUD in China. FUD fail. FUDster can now watch the price keep going up and bite his cheeks for selling everything.
Hmm, so one theory could be this guy who published the article, was paid for by someone with deep pockets to buy in. |
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1047
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Economy / Speculation / Re: 20 articles on 'Bitcoin is broken', researchers warn' doesn;t move price? why?
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on: November 07, 2013, 03:25:57 AM
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I don't claim to know the technical details of why the article in the OP doesn't work, although I've seen lots of people talking about that in the past.
Can somebody shed some light? Why won't that "selfish miner" strategy work?
I haven't looked in detail, but the idea seems to just be a 51% attack that you do in secret -- not very likely. The very premise of "don't communicate your bitcoin find to other miners" makes no sense, as your bitcoins are only bitcoins (and are only redeemable) if they are in the public blockchain. the point of the article is that they release their valid nonce with a delay, so they have a head start for the next block, so they have a larger chance of finding the next block and so one... But indeed, it is almost impossible to keep it as a secret: all other pools will notice it! I think it will work to the benefit of a small pool during a very good streak of luck since they can put some extra effort immediately after the streak ends, by keeping the chain private for sometime. Anyways selfish miners employ pool-hopping already  I read the paper cursorily and it looks like an academic exercise because it's difficult to model luck and variation. |
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1050
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Bitcoin / Hardware / Re: [ANN] US/North American Bitfury sales now open ***full prototype pics***
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on: November 06, 2013, 12:11:04 PM
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More updates on my bad card:
- No matter what I do it will shut off within 5 minutes of beginning mining, although it does not throw a lot of errors while it is mining.
- The shutdown is a slow taper in noncerate to about 10 GH/s, after which is hits 0 GH/s. After this the board does not restart.
- Heatsinking the board like crazy has no effect and thermal diode readings all over the voltage regulators max out at 45C when you start it up, so it's not any kind of heat issue
- Manually setting the clock speed has no effect
- Board position has no effect
At this point I'm just going to say it's a bad board and needs to be RMA'd unfortunately. Dave, will you accept RMAs with heatsinks on them?
Can you please post a picture, front and back side? I had a card performing similarly, I carefully monitored the power consumed by the card. It was ~70 watts. Had to reduce the voltage a bit to make it reliable. |
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1051
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Bitcoin / Hardware / Re: [ANN] US/North American Bitfury sales now open ***full prototype pics***
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on: November 06, 2013, 11:11:56 AM
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Add sinks ... and reduce STRESS in your life . I don't know about that ... sticking on $400 worth of tiny heatsinks per rig was a pretty stressful and time consuming experience for me. I wish somebody would make custom heatsinks for these.  It's a one time exercise, and then peace of mind.  $400 :O They usually sell for $40 good for 4 cards. Actually, I realized after sometime that heatsinking only the bottom 2 rows is sufficient to keep the regulator cool. I see that heat-sinks you used are a different that the VGA RAM sinks. |
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1052
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Economy / Speculation / Re: RALLY!!
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on: November 06, 2013, 11:09:07 AM
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Guys, what is the reason of this sudden price rise? Any fundamental changes happening somewhere?
Please learn one thing and only this thing when trading: the price rises because there are more people buying than selling. If more stuff is bought than sold, where does the stuff come from that is only bought, but not sold? Why is someone buying so much stuff is the question. What changed ? |
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1054
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Economy / Speculation / Re: RALLY!!
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on: November 06, 2013, 10:45:01 AM
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Guys, what is the reason of this sudden price rise? Any fundamental changes happening somewhere?
Please learn one thing and only this thing when trading: the price rises because there are more people buying than selling. The rest will just interfere and aid your lizard brain. Never ever ask again for the reason. Never pay attention to the reasons put forward by the talking heads. Not heeding this advice will lead you to making wrong decisions, trust me  Some markets follow the hoard mentality, and I hope this is not the case, or else it will end up not so well. More or less like penny stock behavior. I hope I am wrong  |
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1055
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Economy / Speculation / Re: RALLY!!
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on: November 06, 2013, 10:08:33 AM
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Guys, what is the reason of this sudden price rise? Any fundamental changes happening somewhere?
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1056
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Bitcoin / Hardware / Re: [ANN] US/North American Bitfury sales now open ***full prototype pics***
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on: November 06, 2013, 09:55:49 AM
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I bought a Multimeter to be able to check the voltage, however I do not know where on the board you would test that. If someone could make a screenshot of that I would really appreciate it, or maybe it already exists?
I have tried all sorts of fans and none seem to keep the regulator cool enough to keep them from cycling. Mine just turn off as well, and do not come back up.
Check voltage on top of the inductor (grey box with PULSE printed on it and any of the GND pin from the PCIE power supply) |
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1057
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Bitcoin / Hardware / Re: [ANN] US/North American Bitfury sales now open ***full prototype pics***
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on: November 06, 2013, 09:52:42 AM
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If you donot add heatsinks to the regulator area, cards will cycle. The real point of adding heatsinks to the ASIC is to keep the regulator cool. Add sinks to the regulator and atleast the bottom 2 rows of ASICS and reduce STRESS in your life . BTW, I also did another mod, but I will not advise anyone to do that unless they know what they are doing. It's obvious if you look at my H-card very carefully.   |
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