Well Philipma1957 does unbiased reviews here and is limited on the power to keep doing new reviews. What do you do with your old miners?  I think his point was that opening the box, plugging it in and running for a day before advertising it for sale doesn't help us much. I personally run my units until they die, or I'm really at 100% capacity. I like to see exactly where the other end of the bathtub curve is, when the units fail, why and how. That tells us a lot. Personally, I'll sell equipment for the right price - bitcoin is a business, and if a product can be sold at profit that means it can be replaced by more of it, or by a better product. I'm not going to lie: I got an S5 review unit which I sold. But I took about 3-4 weeks with the unit, overclocking it, feeding it cold air/hot air, 5V/7v to the fan, trying to make it quieter. Eventually I got a good offer for it (~20% over new) and sold it, because my experience with he SP20 was better and I wanted hardware that has adjustible fans, better tech support, better voltage control, and ports on the front face. being a reviewer doesnt mean you have to be a lifetime customer - it means you'll do a fair review and give the unit sufficient time to fully understand it. |
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Instead of building USB Miners why won't you build something like this.
Put the most chips you can on one board, since its lower power it probably won't start a fire like the Prisma. I can see it running at 5-6Th/s and using only 1000Watts.
Here is why. If you have a set of 3 or 6 usb sticks mining balanced on 3 or 4 pools you earn some btc with the standard pools and have a chance at a solo pool. If they can dial down to very low watt/gh it is possible to do a positive roi in a years time. and of course it gives you a shot at hitting the solo pool block. All this for very little out of pocket cash. why would someone buy 6 USB stickminers that do <10GH/ea and cost likely >$10? A 100GH board could probably be done for <$60, and make way less clutter of the USB ports small-scale mining is kinda pointless - economy of scale means if you spend $200 instead of $20, youll actually get >20x the hashrate and likely a better power efficiency. playing the 'solo lottery' with a USB miner is silly - its like going out and buying a dozen of those $1 scratch cards, instead of a 100-pack for $50 or a 500-pack for $200 |
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I decided to stop messing with the chances of frying the PS or cables, so I stopped using more than one connection per pci-e cable. Better safe than sorry. It did work at lower watts though. At 550 watts it started getting the stock corsair PCI-E cables warm to the touch, bu they were hitting 275W per cable. Thanks for everybody's input though! This is how we learn (the noobies like me). The search function of SMF forums are totally useless (I know, I have the same forum software on my Firearms site) so that's why I keep asking stupid questions.  275w sounds about right. keep an eye on it, since a warm cable increases its resistance, thus getting even warmer (and losing efficiency due to losses in the wire). |
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interesting project - hopefully the USB route will not be the focus, and instead the focus will be on creating large, semi-modular hashing boards similar to the SP10 design.
it doesnt make sense to run a little <100GH device that costs almost $1/GH. Building something with >2TH is the obvious way to go. If I could suggest an idea for one:
-Simple 2U or 4U metal shell (like an SP1x/Sp3x), with an easy way to stack modular hashing boards with 1", 2", or 4" risers (see heatsinks)
-External PCIe connectors, on the same 'front' face as the ethernet connector.
-1 controller can handle up to ~16 boards
- heatsinks are modular - someone with the ability could switch a 2" thick heatsink for a 1" heatsink (or no heatsink) based on the airflow and voltage settings.
- >in this way, a year or two down the road an owner could condensed 8U worth of equipment down to a single 2U or 4U enclosure
-Theres brackets/screw holes for users to provide thier own fans if desired. a lot of early adopters have dozens of old 120MM fans from scrapped miners or from previous fan upgrades.
The trick is doing all this in a way that you dont get lots or DOA complaints or exzchange requests for damage caused by owner assembly.
I personally have about 15x 120mm fans that are capable of >80cfm (about 7 of these are from antminer S1 units), plus lots of power supplies. It would be nice to have a very simplistic device that can be light for shipping and save some cost for me. Scheduling abilities for the voltage are a huge plus
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I saw someone mention they do this, but is it really safe?
For example you have a 2x pci-e power supply but the miner requires 4.
Each pci-e cable has 2 6-pin connectors on it. Let's say you use 800watts total, so about 175 per pci-e connector, but 350 per cable.
Isn't this a bit much for the cables to handle?
I hate to split PCIe cords. If you have to do it make sure to buy decent gauge wire. If you get cheap ones it's asking for trouble. +1. I sell 18awg PCIe y-splitters that are exactly what OP is looking for, and capable of 150W+ per 'branch' the problem is the total draw. Chances are your PSU using 16awg PCIe cables that can hanlde only 250-280W at the most. the gold/platinum-rated stuff might handle 300W. 350w/cable will get really hot and risk melting if not actively cooled |
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For Sale: 100 Spondoolies SP30 Yukon Bitcoin Miners, plugged in and producing! Cost includes ~7 months of professional 3rd party hosting w/Hashplex, 24hr monitoring, remote
Price of miner: $3,401.56 (87% of retail price of $3,895.00; no waiting for delivery; no shipping charges) An Sp30 is available on the used market between $1500-1800USD
Hosting: $99.00 KW/month @ 2.88 KW = $285.12*7 = $1,995.84
Total Price Per Miner plus hosting: $5,397.40
They are rated at 4.5TH/s +/-5%. You get the benefit of our bulk purchase discount plus no shipping charges so you get these way cheaper than you can buy them from the manufacturer, assuming that they had them to sell, which they don’t. And the hosting is very competitive because the energy is very cheap in Washington.
thats outrageously overpriced, and the costing cost isnt all that great either (equal to around $0.14/kwh) |
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So you can have infinite and separated set of addresses at your own disposal based on the passphrase while having one single private key in the form of the seed? That's neat. Thank you.
That's not quite right. There's one mnemonic, that's the 24 word string. Combined with any (or no) passphrase, the mnemonic gets turned into the seed, and then the root private key. Each passphrase you use with the same mnemonic will generate a different root private key. what's the correct way to visualize this? a tree with the root privkey at the top and a new branch extending downwards for each passphrase in a hierarchical tree? picture it like bitcoin mining almost. The 24-word seed is like the list of transactions. The password (25th word of the seed) is like a nonce - any value will work, and can create millions of possibilities. |
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Question: How many different passphrases does Trezor support?
It should be nearly infinite (in the human sense), since the password is effectively a 25th word to the seed. There may be a character limit though. AFAIK the trezor doesnt effectively store anything other than the PIN and the seed - so using dozens or hundreds of passwords shouldnt be an issue |
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Where are people getting these nice small racks for home miners? I could definitely use one!
Home Depot. +1. you can get some pretty decent metal shelving units with wood/fiber panel surfaces and a 400-800 pound capacity for $40-60 life is WAYY easier when you have almost 20sqft of surface to hold heavy units or lots of power supplies. |
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You have a couple months then just wait....... something is bound to come up and it will be shiny.
Wait. 20k is a lot of cash to invest right now. my suggestion: 5K into holding coin. 5k into mining gear on the used market. you can get an SP3x for <$1800USD 10k is kept aside for when a good opportunity comes along to get cheap hardware in the future |
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Guys, help please
Have an sp20 I can login to, see on the network, but it's offline. "awaiting pool etc."
than after a short while it goes offline.
I had another do this and was able to get it back with a few good reboots. No luck with this one.
Is this common? any pointers?
What size PSU are you using? With "after a short while it goes offline" makes me wonder if too small psu and it's going off once hitting a certain hashing speed. I'm running 3 SP20 off two DPs-2000 server power supplies, which are not tripping. And I mean it is accessible for a short while, but never hashes. just eventually goes offline Power supplies are not maxed check all the ethernet cables. reboot your router. add a backup pool that you know 100% works. update the firmware |
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here is my question and his answer (i have decided not to buy it): hi if i would like to get all of them with bitcoin, will you accept escrow from reputable forum member bitcointalk.org ? thanks Hello, I don't know that forum so nobody can be reputable to me there. I'm reputable here on ebay as you can see by my feedback. Feel free to contact all my previous buyers and ask them how it went. Best regards I inquired about these same units myself, got a very similar reply when i asked if he has an online presence elsewhere from ebay. sounds like he might be trying to "sell" these to multiple people for BTC, but only end up shipping to the ebay winners. very much not cool |
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[img]http://www.megamine.com/Spondoolies-action.jpg[/img
There is no chance of water here? Power on the floor like that is so scary in an industrial environment. Doubt theres anywhere in the vicinity water could come from - but i do agree with you. getting some of those power bars an inch or two off the floor would be slightly safer, though very little difference in the long run if the facility has no water sources nearby |
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^change the max watts to 1200W and youll get ~4.3TH/2.6kW
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Sp20 has 8 chips in it, and no PSU.
Sp3x has 30 chips in it, and power supplies.
ergo; the SP3X is worth 3.75x SP20 at minimum
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Do you carry out international shipping?
anything outside of North America is pretty expensive (its about 1kg for every 15 cables), taking several weeks, and I think european vendors offer cables more locally. orders of 100+ can possibly be arranged for direct shipping from the factory though, which is a very affordable method if you can wait ~2weeks for production and shipping |
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^its unfortunate - It was actually a pretty good setup they had, but the fault protection was the real issue. It took hours for the fire to spread, and the staff were BOTH SLEEPING. electrical fires are otherwise easy to stop if you or a protection system trips the breaker.
The sheer density is boggling - not necessarily unsafe, but I would have personally maxed out at about half as many units per 'stack'
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For sure too chubby. Mutual problem I believe  Hard to find bigger than the Nexus 6 ... Samsung Galaxy Tab S 10.5 LTE this is for you  Blackberry passport might be a slightly more reasonably-sized alternative |
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Which connector are you using on the SP20? Is it the actual 20PIn connector on an individual hashing board, or a smaller connector on the control board? if on the control board, this is probably useful: https://github.com/Spondoolies-Tech/u-boot- Serial Ports:
CONFIG_PL010_SERIAL
Define this if you want support for Amba PrimeCell PL010 UARTs.
CONFIG_PL011_SERIAL
Define this if you want support for Amba PrimeCell PL011 UARTs.
CONFIG_PL011_CLOCK
If you have Amba PrimeCell PL011 UARTs, set this variable to
the clock speed of the UARTs.
CONFIG_PL01x_PORTS
If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
define this to a list of base addresses for each (supported)
port. See e.g. include/configs/versatile.h
CONFIG_PL011_SERIAL_RLCR
Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
have separate receive and transmit line control registers. Set
this variable to initialize the extra register.
CONFIG_PL011_SERIAL_FLUSH_ON_INIT
On some platforms (e.g. U8500) U-Boot is loaded by a second stage
boot loader that has already initialized the UART. Define this
variable to flush the UART at init time.
- Pre-Console Buffer:
Prior to the console being initialised (i.e. serial UART
initialised etc) all console output is silently discarded.
Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
buffer any console messages prior to the console being
initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
bytes are output before the console is initialised, the
earlier bytes are discarded.
'Sane' compilers will generate smaller code if
CONFIG_PRE_CON_BUF_SZ is a power of 2 It looks like you might need to access UART while a bootSD is in the system. if you're using the 20pin hashboard connector, youll need to run CGminer on your pc and send a golden nonce at the correct baudrate and listen for a matcing hash. |
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The only viable way this could change would be massive amounts of small devices integrated into home electronics.
I've heard you talk about this web of things type model before, it will never ever ever be even remotely close to viable. Putting single / quad chip PCBs + own controllers + wifi is so incredibly expensive compared to even an S5 formfactor. While I think the idea on it's own is dumb (non starter), devices that are already internet capable can have a sha256 asic integrated at very low cost. Not to mention a lot of the components you listed are cheap as hell when purchased in volume. I've always been pretty adamantly against this happening. it just isnt practical in most use cases. Bitcoin mining is supposed to always be only marginally more profitable than the cost to mine. when MBP has a datacenter with 2MW of power, paying less than 5c/kwh - theres no way a little DVD player with $10 worth of ASIC chips will compete, particularly as the majority of buyers would live where power is >10c/kwh and they likely dont want a constant 20-40W heating element sitting in their media cabinet. the only viable options are space heaters and water heaters. spaceheater-wise; better to just buy an old ASIC like the S1/S3. waterheater-wise; a distributor could come up with a clever way to do it, but water heaters only run about 6hrs/day, and a gas-powered one costs about 1/5th as much as an electric one to operate. theres no real usage case for mining outside of high density, specialized equipment - unless you want a LOT of consumers pissed off because bitcoin made thier power bills outrageously high and their houses obscenely warm |
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