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Author Topic: GekkoScience BM1384 Project Development Discussion  (Read 143301 times)
AJRGale
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August 20, 2015, 04:49:06 AM
 #1601

Unless I was doing something wrong, but given the string'd 1384 pair worked fine off S5 controller and not a straight CP2102 like the U3 (the only difference between the two, as far as connection goes, is the S5-tied had a driven reset line) I'd guess the same would still apply to a jerry-rig. The limitation is in the Icarus driver, near as I can tell. Could be a small change to that might fix it but I'm not really gonna worry about it.

yeah, it was just a thought I might throw at you.. The only other thing other then the U3, I had that was stringed and directly to a CP2012 was them Zeus branded chips for s-crypt mining. everything else used a controller.

(we have come a long way here, 81st page and this is the 1601st post, I remember coming in here half reading everything and demanding pictures!)
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sidehack
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August 20, 2015, 05:17:01 AM
 #1602

Indeed. And with today's bit of information on BM1385 I had to rethink a bit, which means scrapping some of the power design I had planned for the 18-chip Spec1 but it's okay because now it'd be more unified with the 30-chip Spec2. Of course the chip counts are likely to change. That change shouldn't cost much time to a decent prototype, which means time to more sexy prototype pictures.

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AJRGale
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August 20, 2015, 05:35:40 AM
 #1603

Indeed.  blah, BM1385 I had to blah blah design Stuff for the 18-chip Spec1 but it's okay because And things blah blah means time to more sexy prototype pictures.


AW YEAH!
sobe-it
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August 20, 2015, 02:04:36 PM
 #1604

more sexy prototype pictures.

Hell yea who couldn't love them, I have been messing with the nano/bi/hex fury design and its cool seeing a 3d real time rendering.
sidehack
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August 20, 2015, 02:07:08 PM
 #1605

I prefer the real thing. No renders here.

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VirosaGITS
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August 20, 2015, 04:26:27 PM
 #1606

We can be hopeful about that announcement portion:

Quote
Bitmain expects that the next-gen chip will be available for consumer purchase in the near future.
I'm not sure if "consumer purchase" is exactly what "we"/sidehack need but at least it seem to be on the table.

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buysolar
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August 21, 2015, 09:42:19 AM
 #1607

I sure hope s1 repurposing with the latest chips is still on the agenda....
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August 21, 2015, 04:01:30 PM
 #1608

I sure hope s1 repurposing with the latest chips is still on the agenda....


Ditto, been hanging on to my old S1 since that potential was first announced.  Hope to see it come to fruition soon, maybe in time for this coming winter.
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August 21, 2015, 11:48:01 PM
 #1609

I sure hope s1 repurposing with the latest chips is still on the agenda....


Ditto, been hanging on to my old S1 since that potential was first announced.  Hope to see it come to fruition soon, maybe in time for this coming winter.

I got a butt load of S1's, S3's, and C1's as well.
To the best of my knowledge it's Bitmain not selling chips is the holdup.

elrippo
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August 22, 2015, 06:06:58 AM
 #1610

I sure hope s1 repurposing with the latest chips is still on the agenda....


Ditto, been hanging on to my old S1 since that potential was first announced.  Hope to see it come to fruition soon, maybe in time for this coming winter.

I got a butt load of S1's, S3's, and C1's as well.
To the best of my knowledge it's Bitmain not selling chips is the holdup.

Would be nice to see an S1 running on BM1385 chips  Grin Wink (just kidding)
I would be pleased to get boards with the BM1385 chip with a better efficiency than the S7  Cool Roll Eyes Shocked Grin
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August 22, 2015, 09:40:01 AM
 #1611

I would also like to see a more efficient (via more chips per string or via controlable voltage regulation) BM1385-based varient.

 Do the S1/S3/S5 all use the same frame mount points for their hash boards?
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August 22, 2015, 04:07:47 PM
 #1612

I would also like to see a more efficient (via more chips per string or via controlable voltage regulation) BM1385-based varient.
As far as as I know, the 18 chip board will be a 20 chip board whose mounting is hole compatible with 1/2 of a S1/S3/S5/C1 heatsink/waterblock.
Assuming stock clock and Vcore with an operating efficiency of .216 W/GH/s and 80 chips total. 80 x 32.5 GH/s = 2600 GH/s (2.6 TH/s) drawing ~561W.
IF GS et. al. works a little magic and permits Vcore adjustment (which likely they will) this board via devolting/declocking will remain profitable to operate well into 2016.


Do the S1/S3/S5 all use the same frame mount points for their hash boards?

Plus/minus a couple of holes and in a word, YES.
and because the C1 uses S3 hash boards that unit can be included as well.

Now if Bitmain will sell chips, which currently they refuse to do, this endeavor could proceed forward.

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August 22, 2015, 04:13:28 PM
 #1613

BTW, using the projected design one could get 8 20 chip boards into a C1 chassis versus 4 for the S1/S3/S5 making it a 5.2 TH/s liquid cooled machine drawing ~1125W.

And all we (the community) needs are the chips.

sidehack
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August 22, 2015, 04:19:49 PM
 #1614

They don't have to come from Bitmain either, if anyone else would be willing to let us play with their silicon. Avalon, Innosilicon and LK (unless they're using Innosilicon's chip) could contribute. Bitfury and 21e6 are technically able but very likely unwilling due to their selfish and/or nonsensical business models.

Selling seconds 2Pacs for a friend's med bills - PM for details
Currently in development - 20-120GH USB stick; 700GH 75W pod; 4TH volt-adjustable S1/3/5 upgrade kit
Server PSU interface boards and cables. USB and small-scale miners. Hardware hosting, advice and odd-jobs. Supporting the home miner community since 2013 - http://www.gekkoscience.com
QuintLeo
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August 22, 2015, 09:27:46 PM
 #1615

I'm not sure you'll get the full 32.5 GH/s per chip with the undervolt to .6 volts per chip, but should be fairly close with a small undervolt like that at worst.
Depends on how much "overclock" headroom the chips turn out to have.

Trick is to keep the cost under 1/4 of whatever a S7 ends up selling for, otherwise it would make more sense to just get more S7s.

Are thel BM1385 chip specs posted yet anywhere?
sidehack
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August 22, 2015, 09:43:50 PM
 #1616

All our boards should have full-range voltage control. There'll be no 0.6V upper limit. If the S7 doesn't have inherent undervolting ability, our board would actually be better so even priced the same it'd still be the smarter purchase because the viable life is significantly extended without hacking required.

If we can't build the boards priced low enough to be worth buying, we won't build 'em. If the only way to do it is to either outsource manufacturing to a slave-labor or near-slave-labor country, or crap on the design in a way that kills flexibility or reliability, we won't build 'em.

I have seen no chip specs released yet except the sparse data that's been posted in BM1385's announcement.

Selling seconds 2Pacs for a friend's med bills - PM for details
Currently in development - 20-120GH USB stick; 700GH 75W pod; 4TH volt-adjustable S1/3/5 upgrade kit
Server PSU interface boards and cables. USB and small-scale miners. Hardware hosting, advice and odd-jobs. Supporting the home miner community since 2013 - http://www.gekkoscience.com
J4bberwock
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August 22, 2015, 09:45:58 PM
 #1617

I'm not sure you'll get the full 32.5 GH/s per chip with the undervolt to .6 volts per chip, but should be fairly close with a small undervolt like that at worst.
Depends on how much "overclock" headroom the chips turn out to have.

Trick is to keep the cost under 1/4 of whatever a S7 ends up selling for, otherwise it would make more sense to just get more S7s.

Are thel BM1385 chip specs posted yet anywhere?


Do you mean the datasheet that is available on Bitmain website since the announcement of the chip?

https://bitmaintech.com/files/download/BM1385_Datasheet_v2.0.pdf


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TheRealSteve
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August 22, 2015, 09:59:23 PM
 #1618

Do you mean the datasheet that is available on Bitmain website since the announcement of the chip?
Technically that was posted a bit later (had to adjust wiki when it popped up).  It's also somewhat incomplete compared to the previous chips' datasheets.  Unless I keep scrolling past it, there's no package outline - and even fewer sample points on hash rate/power.

J4bberwock
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August 22, 2015, 10:05:54 PM
 #1619

Do you mean the datasheet that is available on Bitmain website since the announcement of the chip?
Technically that was posted a bit later (had to adjust wiki when it popped up).  It's also somewhat incomplete compared to the previous chips' datasheets.  Unless I keep scrolling past it, there's no package outline - and even fewer sample points on hash rate/power.

Less specs maybe because they don't want to sell the chips, at least for now.

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TheRealSteve
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August 22, 2015, 10:08:41 PM
 #1620

Less specs maybe because they don't want to sell the chips, at least for now.
Maybe -  or they just forgot to include those drawings into the PDF.. plenty of other technical detail in there for those wanting to get a bit of a head start.

We'll see, whenever...
[...] Bitmain expects that the next-gen chip will be available for consumer purchase in the near future.
...near future may be Smiley

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