AS for ROI... same for all those USBs, ASIC Blades etc. You dont see them not selling. If you dont like the price, please feel free to move
on. Good luck on sales. You'll always catch some people unable to do math  We don't offer investment advice or counsel. We are a hardware provider. Considering the inventory levels of Bitfury available in the United States, we believe that this is a competitive price based on the fact that BFL is always backlogged and other hardware is pre-ordered for delivery several months away. We encourage you to compare ours price with other inventory that is not backlogged and in hand. cex.io offers immediate hosted Ghash that can be resold at anytime for market price (currently 0.134BTC/GH) also, its worth noting that even at $8000/400GH bitfury system (which will drop the second they clear out the october preorders in the next week or 2 tops), it can be overclocked to >500GH with minimal effort (>550GH if using heatsinks) your product looks great, but the pricing is going to make it a tough sell. |
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bought 2 plastic coin cases from him (for use with casascius coins) and they shipped fairly quick and at a good price +1  |
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I would be interested in the avalon units (<5 BTC per 3-module unit) or bitfury (<2.5BTC per h-board or <35BTC per complete unit)
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you will need to bring down the price. a 25GH bitfury board is $500 and easily OC'd to 35-41GH, and that price was set over a month ago.
you should have these for <$500 and/or make h-boards (similar design) for <$300
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check your drivers.
then check the minirig, maybe you got the fabled "box of fans"
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Any look into building a water cooling system for this. As I understand there are no heat sinks on the board.
What is the spacing between the boards? Is there enough room for a custom water cooling solution?
almost certainly not. unless you have a case for it, the boards likely could not support the bulk size and weight plus hoses assosiated with watercooling, and the cost to implement water cooling for each 25-40GH board would be insane compared to the similar benefits attainable via heatsinks. It would cost roughly $75-150 to put heatsinks on every board in a 400GH kit, and clock it up to >525 for water-cooling, you would see costs of around $200-500 assuming it even fit and was available, and you probably would only get 10-20% better results than the heatsinks. |
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pretty close to the moment where avalon, asicminer, and BFL units will use as much electricity to run as they return in bitcoins.
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No email yet today. Hope they ship soon  I can't wait for news. got a response from yvonne confirming that there was some delays, and my H-board from order #13X should ship tomorrow. She also confirmed that my 2.25BTC of store credit would be applied soon. personally, i'm crossing my fingers that they will soon open sales for 2.25BTC H-boards. It would be great payback for the delayed orders and fit well with recent prices (2.2BTC for the 60gh avalon mini) |
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I have 40GH pointed at ghash.io and cannot wait to double that with another h-board.
Do Bitfury customers get access to the pool when their orders ship ? Curious of the benefits of mining at ghash.io is vs BTCGuild, for example. no, you need to request an account via cex.io or ghash.io the benefit WAS 0% fees, but suddenly it appears that they may have (or soon to be) implementing 3% fees on the pool |
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Any news on h-board shipping ?
+1 I have 40GH pointed at ghash.io and cannot wait to double that with another h-board. btw: is anyone out there NOT overclocking/modding thier boards? I would be happy to offer some sort of hosting service whereby i mod the boards and host them, giving >30GH worth of income until the profit margin falls below 2.5x electricity cost (ie: $0.25/hr worth of BTC) not sure if that would be of interest to many, but it must be a shame to have bitfury boards that are not running at/above stock speed, when 20-40% improvements are available |
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I did not notice this was going on, lol, if anyone wants 1 less that they won in the auction I would pay 2.5 Btc for it, plus shipping and escrow services.
I would give the same, especially if bought from a canadian resident |
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Yes, that whole concept of not reaching ROI because just holding coins would have offered better returns really does not preclude people from attaining a profit in pure dollar terms.
There is always something that could have gotten you better returns. The only question to be answered is whether you personally end up with more of anything than what you started with. If yes, then you win.
worth remembering too youll end up with hardware (diminshing resale value perhaps, but nonetheless a physical item |
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So I guess no shipping today. Slightly disappointing, but let's hope they ship soon.
today was a holiday, is it surprising that nothing took place? hopefully tomorrow we will see shipment notifications |
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Thanks cet for your suggestions, but it didn't work, rPI is boots normal.
This far I tried:
- new SD with new image
- new Raspi (and config.txt with avoid_safe_mode=1)
- other psu
- other router/switch/utp cable
- contacting BFSB....
did you try using ssh, then the command: nano run/shm/.stat.log it should display all the chips/boards that the system detects. If your miner is giving errors about no chips, this would be the place to check and see exactly what the miner is doing |
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Try putting them in a soundproof box, with a hole to get out the cables.
yes. put a hot item into a soundproof box with only 1 hole.  ignore that suggestion as it is trolling at the best. you can take the case off to improve airflow, but this may or may not affect noise much |
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you can also ... regulate with clockspeed ... that's what i did ... I had one board shutting down because graphite getting to low resistance on high temp ... so I put all chips to clockspeed 53 ... now it's again stable ... and I can slowly approach again ... It would be interesting to see which chip is where located .... chips with big distance to the reg & resistor ... will probably have lesser influence ^^ +-+-+-+-+
|3|4|B|C|
+-+-+-+-+
|2|5|A|D|
+-+-+-+-+
|1|6|9|E|
+-+-+-+-+
|0|7|8|F|
+-+-+-+-+
|||||
+++++
im not sure. i clocked chips 3-6 from 54 to 55 and it resulted in errors. right now, all chips are tuned to 54 without an issue and my hashrate is around 39.5GH. I half expect this to rise a little bit, since the resistance seems to fluctuate with the ambient temperature. In the evening when my apartment is the warmest is when ive always seen it produce the highest hashrates but also push the limit where errors take over and start shutting down chips and shunting my hashrate. 42GH seems to be the upper bound before this occurs, at least with my prior heatsink configuration. Im happy to run a few days as it is now to follow the results and see how stability is. (in my mind, anything over 35 is sweet, so to be pushing the lower edge of 40GH is perfect) |
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I believe most people dealing with steve received their refunds on the chips. The remainder I don't believe is an amount one would really think about bolting over. Let's give him some time and see what he says. I'm curious about payments for boards at this point.
I am still owed a refund for my K16 purchase via the website |
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new heatsinks came in today  35x35x6mm with adhesive backings. I just swapped the 5 existing ones (15x15x8mm approx) for 4 of these. each one is just large enough to completely cover the backsides of 4 chips. tweaked my pencil mod a bit to aim back at 40+GH. initial resistance was 1.13K(ohm) and initial voltage read was 0.805V 15 minute readings: voltage: 0.810 hashrate: 37.5-38GHash my hope is that over the next 2-3 hours of operation, maximum temperature will be reached and the voltage will approach my ideal target of 0.825V. however, at this point it looks like it may not go past 0.815v eventually, so i may have to re-pencil it in a few hours once it is confirmed. 24hr readings: voltage: 0.821-0.830 depending which capacitor is measured (closer to the volatge regulator = higher) hashrate: 39-40GH the ambient room temperature feels a few degrees warmer today, which may be causing this result. Either way, it should be noted that this indicates pencil modding results may increase over time and can result in bad performance if the final state is too high based on these results, i am now trying to push chips 3-6 to 55 since they have lowest voltage compared to chips 9,10,15,16 (which run fine at 54 right now) UPDATE: this method did not work. the chip error rates rose significntly, and are fine tuned back down to 54 now. I guess the voltage difference does not enable significant headroom for tuning. all 16 of my chips work best at 54 it seems, and any attempts to push for 55 typically takes it from a 1% error rate to 4-8% errors compared to marginal gain in hashspeed |
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new heatsinks came in today 35x35x6mm with adhesive backings. I just swapped the 5 existing ones (15x15x8mm approx) for 4 of these. each one is just large enough to completely cover the backsides of 4 chips. tweaked my pencil mod a bit to aim back at 40+GH. initial resistance was 1.13K(ohm) and initial voltage read was 0.805V 15 minute readings: voltage: 0.810 hashrate: 37.5-38GHash my hope is that over the next 2-3 hours of operation, maximum temperature will be reached and the voltage will approach my ideal target of 0.825V. however, at this point it looks like it may not go past 0.815v eventually, so i may have to re-pencil it in a few hours once it is confirmed. Im intreagued by those heat sinks, would you have a link handy to some specs, or a store selling them ? ...and please post a followup on how goot they work with, ambient temp and fan specs would be much appreciated also. i got them on ebay, around $1.50 a peice i think. they seem to work quite well and are definitely getting warm. they stuck on with ease (removing them may be a totally different story, the adhesive is on par with glue). I have a 120mm fan aimed directly at the back of the board from about 5" away, a 80mm pointed diagonally at the front face, and a 80mm on the other side of the front, so that its air channels between the RPi and h-board. i think my fan use may be excessive for 1 board, but ive noticed 3 components need to be cooled: 1) the chips (duh) - this is easily achieved by cooling the massive flat back of the PCB 2) the voltage regulator (?) (big cube on chip side of board) - i have some small heatsinks stuck to it that are perhaps a bit too small a footprint, but still work well. the 3rd fan i mentioned blows directly at this area, including component #3 3) the smallish chip/resistor (?) - on the chip side of the board beside component #2. it is very near the pencil-modded resistor and i think a major contributor to the heating and subsequent resistance drop as the unit heats up. I put a tiny heatsink on its backside as seen in the picture, where there are a lot of thermal vias. that heatsink is the warmest of all of them I feel confident that later today i will try to push the pencil mod further. I would buy the resistor seen above but lack the solder tools and skill level to DIY it. (i can solder wires and big stuff, but surfacemount is a recipe for disaster) |
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