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whats the status on CC? I want to get another h-board using the store credit (still waiting on this - will it appear somewhere in my account?) and credit card to cover whatever difference remains
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Dave I just got 5hboards and hashed for about 20 minutes then short out my psu and I took out 5hboards. I am running old V1 right.
...ouch. Are you sure they're all dead? no idea, old v1 still ok but I am going to do test one by one to find out bad board. I was lucky psu shut off and check all new v1 nothing burning. ps: I am testing one of hboard got good hash about 28Gh/s and one miso-err:1 that bad or not anyone know? 1-2 miso errors is okay per board. |
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So h-boards are back in stock with 250 count... where's the shipments?
Wow, I literally hit Save about 30 seconds ago...yes I have a few extra H-cards of the old type that arrived. Since I don't the M-boards for them, they are only useful for filling out your V1 or V2 M-boards. Buy them now, and they will ship immediately. Production is cranking for the next-gen boards, but I haven't received any shipping notifications yet. I expect to see something in the next day or two...when product is on the way I'll give an update. i have not yet gotten my store credit for august delay. push that through and i'll probably buy a board. however, a price drop to $400 would be appropriate i think. $500 is fairly steep at this point |
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What did you do to bring up voltage or were you changing resistors?
"Pencil mod". I'm at work and can't remember the value though. I do remember that it only took a *very* slight change in resistance to get the same voltage of my other cards. If you tell me the value of your R02F resistor, I can tell you what resistance to shoot for. i want to say that i moddd from 31->40GH by changing the resistance from ~1.7K to ~1.570K or something similar. however, it can take a few hours for the resitor to heat up and bring down resistance=rising voltage=further heat, and when errors start kicking in or hashrate drops, just touch it with your finger and a miniscule amount of lead will come away, hopefully raising 0.010-0.030K(ohm) per touch. ive almost found it easier to tune backwards like this, since adding lead is a bit harder to fine-tune (+0.020 to -0.050K each time i attempt to add a miniscule amount of graphite) go to an art store and get a 2B or softer pencil. 2HB lead is hard to work with, and using a 4B pencil is much easier |
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None of them. Buy and hold bitcoins
Yes it seems to be the best option atm. The only way to make profit atm with mining is to get a good BTC/GH miner instant on ebay or so ant then instantaneously sell all hash power on cex.io. However it could be risky since affaik you are obligated to offer this hashrate forever. However its likely that you can buyback the hashpower almost free in a few months. So you have the profit of the beginning margin - the elec costs - buyback costs = which is most likely profitable... Else I didn't find anything which seems to be profitable. Please inform me when you find a way, since I really wanna make profit with mining :-) I don't think you can sell your own hashpower on cex.io yet.. of course you can. theres a sell option right beside the buy option lol |
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ebay. buy on ebay. /sarcasm CEX it up! 0.13-0.14 BTC per 1Gh/s Cex.io (referral link) If you buy a Block Erupter on eBay you at least have PayPal buyers protection and because you buy with dollars you might break even when the BTCUSD ratio gets higher (ignoring that it would be more lucrative to just buy the BTC). serious or joking? because that is a terrible idea. a BE costs about $8-15 and will probably produce about 0.015-0.03BTC in the next 3 months |
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Thanks! Can I reimage the new card on my laptop or does it all have to be done on the pi?
Also, what's the difference between the image file and the chainminer files?
EDIT: Anyone?
the sd card image file should have the newest chainminer on it. (if you, you update later once the rig is running) SD card can be imaged from whatever your daily deaktop/laptop is |
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As we are closer to the date/ final hashrates, we have adjusted the price.
funny how only 3-4 days ago you were defending a 6.3BTC/$999 pricing. what about the fact that current exchange rate puts 6BTC = >$1000? |
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you might like dealextreme.com it has low-priced, high power gear that is pretty decent. only catch is that it takes 3-4 weeks shipping from china
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Update for v1 M board owners. If you want to use the latest build of chainminer with your version 1 M-board please do the following a) Download chainminer master on your raspberry PI from github and unzip it https://github.com/bfsb/chainminer/archive/master.zip 1 #ifndef MINER_H
2 #define MINER_H
3 #include "handylib.h"
4
5 #define NDEBUG
6 #define VERSION 1 c) make cd chainminer-master
make
cd ..
d) move /opt/bitfury/chainminer mv /opt/bitfury/chainminer /opt/bitfury/chainminer_v1_original e) copy chainminer-master directory to /opt/bitfury/chainminer cp -r chainminer-master /opt/bitfury/chainminer
f) mine with latest chainminer goodness  What is the update getting you? Better stability? Better performance? In my experience (v2 board - v1 should be similar), the chainminer update improved stability such that error rates went from 3-10% per chip (5-7% average, consisting mostly of HW, but a few miso or spi) to 0-3% per chip (1-2% average, virtually no spi/miso errors). this also allows a bit more room to overclock for better hashrate, on top of the 2-3GH reclaimed from removal of errors per card) |
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title says it all, im loking to add some hashrate to my bitfury kit, and can offer up to $400 per board.
will also consider EOL boards if the price is right
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Hi everybody..
my 8 Cards are running the last weeks very stable and with no problems. now after a reboot, the put.log shows that i have 12 boards and many miso and spi errors...
i have changed the m-boards, but same results. i also installed the miner new. someone has an idea?!
I had the same experience and I contacted punin for this. He will receive 2 M-boards from me this week (tomorrow/Tuesday) so he can investigate what's going on. sounds like it may be an issue on the sd card image? have you installed the newest chainminer? |
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I have a v1.0 M-board. I currently have 2 EOL h-boards and cannot put them in line on the same m-board..
Would anyone be able to fix/mod the one EOL board with the least GH/s so it can play nice with the others? Or Should I just sell the EOL board for cheap?
Also have one brand new V1.0 m-board that I wanted to rid of.
(Didn't want to buy another power supply just for the EOL board.)
I'll give you $300 for an EOL board. ill offer $150 + $15 per working chip on the board (ie: if 10/16 chips operate, $300) In canada |
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Hi all - I've been in contact with the factory early this morning. They are making 1000's of boards and shipping in earnest next week. We will be *very* busy building, testing and shipping rigs to you. Please don't knock me for not camping on the forum thread for the next two weeks. I'll do my best.
Don't expect half-price H-boards or rigs to appear on the store any time soon. Tytus and I are not believers in the endless-doubling of difficulty theory promoted by sites like TGB. We'll mine our own equipment before we fire sale hardware.
I am making USB miners, which should show up before the end of the month.
Regards,
Dave
Where can order the USB miners? Do you mean they will show as available on the megabigpower site, or that they can be ordered now and show up in my mailbox before the end of the month? Dave is trying to avoid the preorder game as much as he can. When he has them in hand they will be available on his site. cex.io has been hinting at the availability of usb miners in future, perhaps these will be what dave produces/sells |
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OK I'm back up and running again, but one H-board I think needs to be looked at. I checked each of the new H-board individually, and one of them doesn't want to play anymore... Every time I use it either in a group with other cards or by itself, it seems to trip up my PSU and everything goes dead.
What can I check with my multi-meter to see if anything is damaged? I checked the big thing with the word "Pulse" on it, since I heard it was a fuse. I do get a little bit of a reading with my multi-meter, so I assume that isn't blown.
I wish MBP would have sent an identical board like what was sent in August. Those seem to be a little more robust.
the 'pulse' cube is an inductor if im correct. i put a tiny heatsink on mine to cool it but its probably unneccessary. the fuse is actually a 'polyfuse' and is the big flat resistor-like item marked F300L or something similar. it is resettable and will work again after a failure if the power is turned off. (intron has a post about it somewhere in the forums) if its tripping the psu, thats not good, and is quite strange. it would indicate that either the psu is having far too much load taken across its connection (what brand/capacity is yours, and how is it wired to the m-board?) or that there is some sort of backfeed from the board. (less likely) I would suggest looking at the small chip located near the inductor/pulse cube. it is the regulator and gets very hot during operation over 0.8V or 32GH. it should be unable to blow or fail (presumably), but from your issue it seems like a potential place to check first for any discolouration or damage. youll know the component by its ~12 pins and the thermal vias on the backside of the board |
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So your time needed to keep the miner running (maintenance) is free/worthless?
The wear and tear of components involved (e.g. PSU) has no monetary value?
hopefully you would include the psu in your cost analysis. Additionally to your mining income, you have a physical piece of hardware with some resale or collectible value. as for time/maintenance - its free if you enjoy tinkering, and these systems are quite stable once configured correctly. |
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Just installed my 3 new H-Boards with pencil mod... They ran at 25Gh, 25Gh, and 31Gh out of the box. Now they are doing 32Gh, 35Gh, and 35Gh... All around 1.72-1.73k Ohm resistance on that R02F resistor. So far, I'm very happy. Pictures here: http://imgur.com/a/45QmA#0Well I woke up all three of my new boards not hashing anymore... I think I want to vomit. Any suggestions to try to with my multi-meter? at 35GH you need to have heatsinks and fans. IME: 25GH : no/minimal airflow needed, no heatsinks needed 30GH : airflow needed 35GH : airflow + some heatsinking required 40GH : airflow and decent heatsinking required (I use 4 * 35x35x6mm heatsinks, plus tiny heatsinks on the face of each chip [probably unneccessary to cool from the front], plus a few tiny heatsinks on the inductor and the backside of the regulator. 45GH : I would imagine you need a more intensive method such as copper heatsinks or liquid/immersion cooling In your setup i cannot imagine pushing more than 32-35GH per card without problems.Its also worth noting that when a pencil mod is in use, it tends to creep a little bit as the board gets warm or ambient temps rise. I often see a pencil mod board start up at xxGH, after an hour its xx+1GH, after 6hrs its xx+3GH, and at the warm points in the day is can be up to xx+4GH needless to say, this means that the pencil mod sometimes nees to be repeted a few times, with 3-12hr sampling time to see what sort of speed you get. if the components get hot, the hashrate can get wonky or the chips/regulator will switch off. btw, wasnt dave supposed to roll out some v2 m-boards to those still using the v1? by being able to put cards in each bank it gives much more space in an unfilled unit to get heatsinks or airflow. I actually found that the gap between slots 1 and 5 is perfect for leaning an 80mm fan at a 45degree angle against the card in slot 5, so that the slot1 card has sufficient airflow ps: if you have another fan or case fan, aim it directly at the backside of card #4. it will cool it much better then the fan at the side is currently doing, since its airflow is making little/no contact with the backside of the board, which is the hottest region to cool |
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it will probably produce 4-6BTC during its lifetime, assuming you have cheap power or utilize its power use to heat your home.
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seems that without direct airflow on my slot 1 card, 41GH speeds cannot be maintained. ive tuned it back to 34.5GH for now, and have the new card running nicely at 30GH (tweaking soon to come) update: now at 36Gh and 35GH each respectively  |
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my h-board just arrived, and fedex lady took off without asking for $31.20 in taxes/duties! ramping up to speed now, card looks good but who/whatever aligns the big dc power cube on the board did an amazingly bad job - its skewed at about a 20 degree angle. still totally functional, but visibly off-angle |
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