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1881
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Bitcoin / Hardware / Re: GekkoScience BM1384 Project Development Discussion
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on: December 31, 2015, 10:03:08 PM
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 Just thought I'd show this off a little. Right now I can't get it to work past 225MHz (99GH) because the regulator is dropping out. I know what particular symptom is causing the dropout, but I'm as of yet unable to figure out what's causing that symptom. Basically, the internal 5V LDO on the TPS53355 is sagging when it starts to push more power. The initial problem with resetting I was running into was based on this - the bootstrap was drawing too much current during switch, causing the LDO to bottom out below threshold and reset the chip. I fixed that problem enough that now it starts, and it looks like I have stable hashing at 100% which is great. But when the current ramps up from either too high voltage at a given frequency (right now, if I turn it up any farther at 225MHz) or too high frequency at a given voltage (it should run 250MHz at the current voltage setting if the buck would allow it) the VREG5 slides down below 4V and resets power, which kills my string. I am primarily vexed because the hacked '53 I was using earlier did not have this problem. Its 5V was stable all the way to 820mV 300MHz. If anyone has some fresh insight as to why an internal LDO would bottom out so badly, let me know. I'll be poking for the next couple hours and hopefully I'll figure it out and won't need advice, but there's a lot of smart people around here and it rarely hurts to ask. But for now I have a stable 100GH miner. Which is pretty cool. Basically I have an S2 board with 1/8 as many ASICs and approximately 1/3 the power draw. Not good enough yet to sell, but still pretty good. When it'll run 350MHz stable I'd call it good enough to sell, but then I'd keep tweaking until it could do 400MHz pretty reliably. That should give Novak time to finish up the controls firmware. What are you running of the internal 5v LDO, and how much current is it pulling? |
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1888
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Bitcoin / Hardware / Re: Here's a converter that will turn your 120 volt US plug into 220 volt plug.
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on: December 23, 2015, 06:29:22 PM
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Sigh...people should not post shit like this if they don't know what they are talking about.
If you are a miner DO NOT USE THIS TO "MAGICALLY" GET A 240V OUTLET. Nothing will replace a true 240v line coming from a dual pole breaker in your panel. You will still be limited by 120v current, all this does is add another 10-20% efficiency loss on your line. Sure you can run your 240v only server PSU on it, but since most of those PSUs are over 2kw you'll trip your breaker before you get anywhere close to that anyway.
For that price you can probably get a real 240v line installed anyway.
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1889
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Bitcoin / Hardware / Re: Bitfury: "16nm... sales to public start shortly"
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on: December 23, 2015, 06:14:28 PM
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They taped out the scrypt A4 chip. Nothing on the SHA A3. They are also still looking for investors to buy the masks for the A4, so it will be a while before anything comes out...and definitely nothing on the horizon for SHA chips. |
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1891
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Economy / Service Announcements / Re: [ANN] Bitfury ASIC sales in EU and Europe
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on: December 22, 2015, 06:37:55 PM
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I think what he means is, since the chips are chained each is at a different local ground so chip-to-chip signalling might need to be shifted; is that handled internally?
The beauty of this design is that the coms are chained as well, so chip to chip is already "auto" shifted. You can see all they have is just an external resistor divider network on the coms line. Of course the end nodes still need to be shifted, but in terms of serial chain design this is as simple as it gets. |
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1892
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Economy / Service Announcements / Re: [ANN] Bitfury ASIC sales in EU and Europe
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on: December 22, 2015, 02:10:38 AM
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I quote air cooling stats because I have no rodent hindquarters to donate regarding immersion cooling. I want to play with these chips and I design for practical air cooling because that covers myself and all my target customers. I do not care at all what Bitfury builds for themselves or their millionaire buddies. That's my reason; can't speak for anyone else.
Indeed...and designing a power stage to deliver clean and effecient .3v power should be interesting haha, even at 5w were talking about near 20amps of current. The only way to achieve those efficiencies at that voltage level is with a chain design...otherwise your looking at less than 80% efficiency just at the buck at those voltages. |
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1893
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Alternate cryptocurrencies / Mining (Altcoins) / Re: Zeus vs KnC
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on: December 21, 2015, 07:42:06 PM
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Hey guys,
I am brand new to this forum-site, but am reading a lot because i want to know if it is still proffitable starting mining right now?
I do a lot of research of different miners but can't seem to find the proper gear to start.
What if i have a budget of around 5K USD. Can somebody tell me what is best to start with?
I saw the Zeus Volcano, but also read some articles of the KNC titans.
I now only look at scrypt mining because of some scrypt-coin calculations i made, i think this is more profitable then SHA-256 mining.
Right now i pay 0,24 cents for current.....(yes i know it is a lot)
But when i check out the mining-calculators on coinwarz.com some of the scrypt coins are still quite profitable....
What can you guys tell me, inform me, teach me?
Because i can't seem to contact zeusminer.com and at the site of KnC i can't seem to find the miners.....
Please let me know what you think (maybe i look at it wrongly and can someone steer me in the right direction)
Many thanks in advance.
You have a lot of research to do. KNC and Zeus are long gone, neither make scrypt hardware anymore. Zeus was first gen scrypt and those chips are no longer profitable. Your best bet for "new" hardware is Innosilicon, with their A2 stuff. Otherwise you can pick up used Titans which offer the best efficiency of whatever is out there currently. |
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1896
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Alternate cryptocurrencies / Marketplace (Altcoins) / Re: [OPEN] Official FutureBit MoonLander USB Scrypt Stick Order Thread
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on: December 18, 2015, 06:12:49 AM
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The batch is officially sold out! Thanks to all that put their trust in me and ordered in advanced of shipping. Things are still on track to get these assembled and start shipping end of Dec/first week of Jan so all the orders keep an eye on this thread and will keep you updated. Ill ask for final payment + shipping when I can ship your order within 24 hours. These will be shipped out in the order I received original requests (check the order sheet the list is in the right order). Ill post more detailed instructions closer to shipping date.
Congratz! Love to see projects like this do well. Hope its the first of many scrypt projects from you  . Big thing these day's to sell out. So really congratulations. I think it really shows the support the community is willing to provide to homegrown asic solutions, were tired of the announcements with the huge price, extreme shipping cost and no competitors to choose from. Just wish we had more chips to choose from and build stuff with! |
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1898
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Alternate cryptocurrencies / Marketplace (Altcoins) / Re: [OPEN] Official FutureBit MoonLander USB Scrypt Stick Order Thread
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on: December 16, 2015, 08:16:54 PM
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The batch is officially sold out! Thanks to all that put their trust in me and ordered in advanced of shipping. Things are still on track to get these assembled and start shipping end of Dec/first week of Jan so all the orders keep an eye on this thread and will keep you updated. Ill ask for final payment + shipping when I can ship your order within 24 hours. These will be shipped out in the order I received original requests (check the order sheet the list is in the right order). Ill post more detailed instructions closer to shipping date.
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