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Really interesting, but where did this come from? Ive seen no real history of the user/unit, and it seems like each board contains 16 chips running at approx. 137mhash each.
Pricing is a bit high, since you could get as much hashrate from 7 block erupters for basically the same price (and they are tested and known legit)
I would suggest a price of 1.25-1.5BTC, since there is very little chance this will produce more than 1.25 BTC within a year
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However - as my opinion whether you are recommended to buy or not buy - I don't know your regulations there and suppose they're quite strict, like FCC stuff and EMC tests. Until for example proper measurements of equipment are done - it may be risky to install many of these near yourself due to electromagnetic emission and noise. So either properly designer board and/or filters and/or shielding is required. I hope that this would be clarified soon. This is also true for homebrew devices that you make and don't care about switching noise such devices produce (like I saw in some DIY stuff where powering of such high-power chips are done in absolutely insane ways, or like problems with other asic vendors, you know them by the way likely, where their shipments were banned by customs due to these violations).
Anyway, as far as I know Dave has as well options to install miners in his location - this would be likely safe in any way, and maybe if you install these - before proper measurements done (i.e. in special laboratory with antennas where typically EMC measurements are done) - this maybe risky to install at home, or at least close to you - so don't sit near miner 24x7 and don't put those close to you.
You should care about that and do not put your health into unnecessary risk. However I suppose Dave will do his best to solve these issues and make device fully compliant for safe usage. However that still won't mean that such equipment can be installed in bulk at home, and should be spreaded in space for maintaining safely low electromagnetic noise. Likely also undervolted boards is nice choice for safety, but all of that should be measured, and likely will be measured, the only delay could be there (and it is basically your choice) that such measurements could take additional time and can't be done before August timeframe. This depends.
I apologize if this has been covered, I tried skimming the thread, and may have missed this. I'm a software guy, not much on hardware, EM emission & noise safety precautions. Can someone please point me to a thread or some resources where I can take the necessary precautions to prevent health risks to myself and those around me? I plan on operating both a BitFury Full Kit, and a HashFast BabyJet in my 1 bed + den apartment. Would I need to purchase special casing/shielding etc to prevent health risks? If I ran both these units in a small well-ventilated den, and I stayed away from the room for the most of the time, would I be ok? Also, if it were to burst into flames, is there some auto-sprinkler device or some shielding I can use to prevent burning my landlord's building down, in the event no one is present? Any resources/threads on this would be very appreciated! EDIT: I skimmed the thread more and nobody commented on bitfury's post about EM emmission & noise safety... And this disclaimer came from BITFURY himself! im not an electrical engineer or anything, but i would imagine the risks are fairly low - we are surrounded by poorly shielded electronics daily. However, I would advise not putting this near your bed/couch/desk where it is in close proximity for long periods of time, because that is the greatest likeliness of harm Alternatively, i *believe* a grounded tinfoil wall/shield will stop some (how much i dont know) of the emissions. Alternatively V2.0 : wear a tinfoil hat. they are scientifically proven to protect you from the harms of science |
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Apart from the 600GH/s nonsense, this is one of the better ROI evaluations I have encountered recently.
If you can call it that, considering it was done based on 1.5X the expected hashrate ps: do we have any idea how much (or at all) the H-boards can OC? I know we are limited by power, but is there any margin to push it up by 5-10% with little or no change to voltage? |
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... Err. excuse me. ASICMiner put out a product that sold out within 30 minutes. Whose fault is is that it sold out? THE PEOPLE BUYING IT. Perhaps the USB sticks were just too sexy to resist  If you think everyone is pissed off with AM, then I guess the new blades won't sell at all .... fancy a bet on that? Yes indeed, most miners who buy AsicMinerUSBs either don't care about making a profit or are foolish enough to not realise that they made a loss buying them. The ASIC era has clearly shown how bitcoin is full of fools. I bought 2 with the possible goals: 1) resell for outrageous profit 2) mine for 2-3 months, recouping as much cost as i can, so that : 2a) resell hardware for whatever its worth 2b) keep the hardware as a momento of the ASIC wave turns out, option 1 is what happened. I resold the first for 1.25BTC (I paid 1.48BTC for both), and the second for 4oz of silver bullion (~$88) and 0.12BTC. During the process, I mined about 0.073 BTC say what you like, but there is some margin for profit! |
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with the RPi be capable of running USB devices attached to it such as block erupters or BFL products, or not with the custom SD firmware?
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I am seeing 50 packs of BE USBs for 18.50 BTC (1.15BTC/Ghash) vs Blade for 14.99 BTC (1.15-1.5BTC/Ghash depending on overclock)
this doesnt make much sense to me, since the BEs could be paired with enough USB ports for around 1.00-2.00 BTC?
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where are you? i can provide 1 locally within toronto
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Who is this "teek" guy for Canada? Never heard of him.
Right here www.wtcr.cayou'll be hearing from me the second pricing on new blades is announced! Based on the block erupter prices and profitability, hopefully we can see prices in the 0.8-1.1BTC/Ghash range! |
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I know the erupters run hot but what evidence is there that fans are necessary? Has anyone lost an erupter from overheating?
I tested with two Erupters. One runs without any air moving around it, the other lies flat on P4-grade heatsink with copper core and as much contact surface as I could get. The first one hashes at 280~310, the other one at 338, and the uncooled one gets twice as many HW errors. Switching which one gets cooled, switches performance figures as well. So yes, cooling plays some role. However, a bank of closely sitting 18 Erupters (in 3 D-Link hubs, which lie one on top of the other), which get cooled by one Acrctic Breeze fan blowing strait at them, all run at 335 and 1-7 HW errors each (after 10 hours). I found that without any cooling, they run around 335Mhash and about 1.3-1.8% HW errors. minimal cooling or airflow improves it to about 335.5mhash and 0.9-1.3% HW errors. (i have a usb fan in the mail because i hate how hot these get in proximity to my fingers (laptop)) |
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Or, if you have spare parts or work with someone who does, here's what I need: - One (1) Batch 3 PDU (what I have looks different than this picture: https://en.bitcoin.it/wiki/Avalon#PDU ) (see posts linked to above for pictures) - four (4) power cables. - one (1) usb cable - one (1) 10-wire cable connecting the PDU to the Control Unit - 5 zip ties If you can give me a quote for these components along with shipping costs and estimated delivery time to middle USA, please PM me. the zipties, usb cable, and power cable could be easily sourced locally i imagine, perhaps an avalon support ticket could help you get the PDU? |
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What PSU model would you recommend?
It would depend how many H-boards are in use. A starter kit would work fine with a 350W supply, even a 200W supply likely. A full 400GHash rig would need at least 500W (assuming that bitfury is operating near the 1w/GHash design), but a 750W supply would be best |
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Hi
I am hoping someone can help me
I have installed the driver for the USB Block Erupters but only 1 is reconised.
Every time I plug another one in to the same usb or a different usb I get that the Block Erupters is not reconsidered or that the USB device has failed.
2 of the 4 I have just come up with nothing and do not show in device manager.
I of those 2 does not have the LED light come on.
Can anyone help please
Ignore all the hub comments below, since nothing you stated indicates a hub is in use (or am i wrong?). If running from direct USB ports, insufficient current should not be an issue like it is with an under-powered hub I had a similar issue where the driver on one port installed fine but not for the other. try the following: 1) reboot. if the driver is in but not initialised right, this time around it should recognise the BE instantly 2) check under devices and printers, and check the detailed properties for each device Identify the one(s) using generic controller drivers, uninstall the drivers, and try the zadig (or similar winusb driver) exe again. Some unplugging/replugging the BE(s) in question may help initialize the correct driver configuration/setup. 3) if needed reboot again for me, this worked. Windows had setup 1 device as the correct winUSB driver, but the other as a generic UART 2012 bridge host or similar. The above 'method' got me up and running quickly. |
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given the changing landscape in the asic field - are you considering adjusting prices for october delivery? boards or full units etc
looks like prices go up, thats been the trend with every other company so far it seems : show your prototype, demand rises, price rises I know that the second these begin shipping I would be locking in on any boards left - until then its as big a gamble as BFL |
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would this heatsink also be placed on the backside of the chip?
Yes, the bottom layer is kept clear from components, so the heatsink will fit snugly. Just like the USB Block Erupters. Not sure if it will be fixed with bolts or heat conducting glue. intron Bolts would be best, it allows hardcore users to swap for thier own heatsink designs more easily and with no damage to the unit (unlike removing glued components) |
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Is there somewhere with more info on these sticks just as how to assess if they are heat damaged
I would imagine heat damage will cause one of 2 things: 1) reduced hash rate. These run very precisely (ive got 335 Mhash and 334.9 Mhash respectively), and heat damage to the asic chip would result in fewer (if any) hashes. 2) increased error rate: much more rejected shares or hardware errors. I find with a small heatsink to add slight cooling bonus, my HW errors sits around 1.3%. Without any cooling, and the 2 devices horizontal above eachother and creep up to 1.5-2.3% error rate. this alone makes a little bit of forced cooling a bonus for hardware lifespan and ROI thought i would throw some more info on top of my prior post. I have sold (at profit!) one of my two devices, which results in the lone unit having better airflow, no longer a tigh-squeezed device directly above, and a second small heatsink added. With this change, the device's hash rate has seemingly crept from 335.0 Mhash/s --> 335.4 Mhash/s and the error rate has dropped to less than 1% some gain may come from CGMiner controlling half as many devices, but it would seem that lower temperatures are the primary cause. I'll try to throw in an update once there is a greater sample count if the HW errors settle to a constant % |
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Is there somewhere with more info on these sticks just as how to assess if they are heat damaged
+1 I would imagine heat damage will cause one of 2 things: 1) reduced hash rate. These run very precisely (ive got 335 Mhash and 334.9 Mhash respectively), and heat damage to the asic chip would result in fewer (if any) hashes. 2) increased error rate: much more rejected shares or hardware errors. I find with a small heatsink to add slight cooling bonus, my HW errors sits around 1.3%. Without any cooling, and the 2 devices horizontal above eachother and creep up to 1.5-2.3% error rate. this alone makes a little bit of forced cooling a bonus for hardware lifespan and ROI |
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getting an 'access temporarily denied' error when trying to login today?
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Jeez, these things really make some heat! I'm going out ASAP to grab some small heatsinks and/or better thermal tape. These dont get warm to the touch, they get HOT. removing them or handling them within 5min of unplugging is still enough to singe your fingers
An Artic USB fan works fine for cooliing these. you can touch them. i have a hub, fan, and heatsinks on order, but expect at least a week for delivery (I dont want/plan to throw down $20 at a local store for only to BEs!) for the time, ive put some small chopped up gpu heatsinks on them, but its anything but professional a job. Either way, they draw away the heat and improve surface area a bit |
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Jeez, these things really make some heat! I'm going out ASAP to grab some small heatsinks and/or better thermal tape. These dont get warm to the touch, they get HOT. removing them or handling them within 5min of unplugging is still enough to singe your fingers
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possibly using bitfury chips in the region of ~2Ghash for 2w, but that may be a while away still
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