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Author Topic: GekkoScience is now dabbling with 16nm ASICs for new designs  (Read 71443 times)
sidehack
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January 25, 2017, 05:18:57 PM
 #581

Finally got around to building a test 2Pac with good chips. The first 3 test sticks (used by VH for driver dev) were built with out-of-spec rejects from Compac manufacture, meaning they ran hot or poorly from the get-go and wouldn't be representative of the performance of a stock manufactured stick.

Yesterday I got the robot set up to run out 2Pacs, today I did a bit of dabbling with voltage ranges on the buck. I had noted that these guys don't particularly like to initialize below about 630mV per node even though at low frequencies (100MHz) they should be good to 600mV, but at the bottom threshold of voltage, chip power draw balance and node-level storage matters a whole heck of a lot. So I figured up buck voltage adjustment resistors that'll give you 630mV to about 830mV, which means it should be good for at least 400MHz.

I ran a quick efficiency test, only up to 300MHz because my USB power meter is only rated for 3A.

FreqGHVcorePowerJ/GH
10011.001.263.670.33
12513.751.264.480.33
15016.501.265.270.32
17519.251.266.120.32
20022.001.327.430.34
22524.751.368.730.35
25027.501.4010.110.37
27530.251.4612.250.40
30033.001.5013.980.42

As you can see, efficiency across the bottom end of frequencies is pretty flat. That's because they're all at the same voltage level. Efficiency actually improves slightly with an increase in frequency because the maintenance current (buck controller, LDOs, CP2102 etc) is pretty constant so a higher proportion of power is used for mining.

At 300MHz, the total device efficiency is only about 15% worse than the datasheet chip-level efficiency, which I think is pretty good for a stick miner. It also puts up over 30GH, which I think is pretty darn good for a stickminer. Note this is about the same power draw the original Compac expected to see at 22GH, so we're seeing a 50% improvement in hashrate. If the stick could be pushed to 400MHz you'd see it drawing about 23W for 44GH, but I don't want to test this until I have a bit stouter measurement tool.

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NotFuzzyWarm
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January 25, 2017, 07:33:26 PM
 #582

Sounding REAL good there! Smiley

-Joshua Zipkin aka Joshua Alexander leaked AMT A1 miner skype chats http://bit.ly/1Qjt6lj
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sidehack
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January 25, 2017, 07:38:22 PM
 #583

It should also be encouraging that the BF16 stickminer will use the same power system (different voltage range of course) and formfactor, just with upgraded controls. So if this guy is comfortable up above 13W, think what'll happen when it's got 0.1J/GH chips instead of 0.4J/GH chips. The BF16 stick could be most of an S1 by itself.

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January 25, 2017, 07:46:38 PM
 #584

Quote
The BF16 stick could be most of an S1 by itself.

Now that in itself is statement to how fast mining ASIC's have evolved Cheesy

-Joshua Zipkin aka Joshua Alexander leaked AMT A1 miner skype chats http://bit.ly/1Qjt6lj
-For bitcoin to succeed the community must police itself.
-Support Sidehacks miner development. Donations to:   1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr
sidehack
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January 25, 2017, 08:08:26 PM
 #585

Yeah, no doubt. The current generation of Bitfury and Bitmain chips are literally 100 times better than the first-gen Avalon and ASICMiner chips from less than four years ago.

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January 26, 2017, 03:03:18 AM
 #586

Finally got around to building a test 2Pac with good chips. The first 3 test sticks (used by VH for driver dev) were built with out-of-spec rejects from Compac manufacture, meaning they ran hot or poorly from the get-go and wouldn't be representative of the performance of a stock manufactured stick.

Yesterday I got the robot set up to run out 2Pacs, today I did a bit of dabbling with voltage ranges on the buck. I had noted that these guys don't particularly like to initialize below about 630mV per node even though at low frequencies (100MHz) they should be good to 600mV, but at the bottom threshold of voltage, chip power draw balance and node-level storage matters a whole heck of a lot. So I figured up buck voltage adjustment resistors that'll give you 630mV to about 830mV, which means it should be good for at least 400MHz.

I ran a quick efficiency test, only up to 300MHz because my USB power meter is only rated for 3A.

FreqGHVcorePowerJ/GH
10011.001.263.670.33
12513.751.264.480.33
15016.501.265.270.32
17519.251.266.120.32
20022.001.327.430.34
22524.751.368.730.35
25027.501.4010.110.37
27530.251.4612.250.40
30033.001.5013.980.42


As you can see, efficiency across the bottom end of frequencies is pretty flat. That's because they're all at the same voltage level. Efficiency actually improves slightly with an increase in frequency because the maintenance current (buck controller, LDOs, CP2102 etc) is pretty constant so a higher proportion of power is used for mining.

At 300MHz, the total device efficiency is only about 15% worse than the datasheet chip-level efficiency, which I think is pretty good for a stick miner. It also puts up over 30GH, which I think is pretty darn good for a stickminer. Note this is about the same power draw the original Compac expected to see at 22GH, so we're seeing a 50% improvement in hashrate. If the stick could be pushed to 400MHz you'd see it drawing about 23W for 44GH, but I don't want to test this until I have a bit stouter measurement tool.


This is some nice number!  Grin

██     Please support sidehack with his new miner project Send to :

1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr
leowonderful
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January 26, 2017, 11:36:12 AM
 #587

Great numbers for efficiency! Currently waiting for another usb fan to arrive, once that and my 2Pac gets here I'll certainly be trying to hit 300 MHz and above. Can't wait for the BF sticks and miners, can't even imagine how fun those will be to overclock!! They might even replace my S3's and older miners with efficiency Smiley














 

 

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in2tactics
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January 26, 2017, 11:41:32 AM
 #588

Looking good!

Active... 2x AntMiner S7-LN and 5x AntMiner U1
Collecting Dust... 2x ASICMiner Block Erupter Cube, 4x AntMiner S3, 4x AntMiner S1, GAW Black Widow, and ZeusMiner Thunder X6
Coin Interests... BTC, LTC, DOGE
willi9974
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January 26, 2017, 07:47:07 PM
 #589

Nice
Can The sticks already be ordered?

Best Regards from Germany
Willi

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My Solo Block 385022, 394940, 394946, 395087, 396941, 399709, 401934
sidehack
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January 26, 2017, 08:26:49 PM
 #590

Anything in Germany will likely want to talk to MacEntyre, the proprietor of bitshopper.de - he'll be stocking 2Pacs as soon as they're ready, and has already expressed interest in licensing BF16 designs for manufacture and sale in Europe.

willi9974
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January 26, 2017, 09:05:59 PM
 #591

Perfect, so i will contact MacEntyre

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My Solo Block 385022, 394940, 394946, 395087, 396941, 399709, 401934
sidehack
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February 10, 2017, 03:47:28 AM
 #592

The Bitshopper 2Pac PCBs are in, so I'll get started manufacturing those before long. The same order also had Biggie pod prototype PCBs, so maybe I'll get to building one of those soon and seeing how it works.

The biggest problem I'm having with 2Pac assembly is paste application and wetting on the pads of ASICs and other fine-pitch QFN chips, which thoroughly dominate the complexity of the Biggie. So I'll have to work on the assembly process to solve that problem and make sure the minion currently in charge of running the pick-and-place does it right.

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February 14, 2017, 01:23:46 PM
 #593

Can't wait for the biggie!
BustyKuroNeko
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February 14, 2017, 02:06:57 PM
 #594

I can't wait for the S5 upgrade board  Smiley They can't come soon enough.

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Spill
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February 15, 2017, 04:56:17 PM
 #595

Hi sidehack,  sorry for the noob question but would this usb miner be able to take advantage of a usb3.1 port 900mA?
If its plugged it into a 3.1 usb port?  Thank you for your hard work.

murasame2003
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February 15, 2017, 07:28:38 PM
 #596

Hi sidehack,  sorry for the noob question but would this usb miner be able to take advantage of a usb3.1 port 900mA?
If its plugged it into a 3.1 usb port?  Thank you for your hard work.

It certainly can take advantage of additional amp available for a port.
vh posted a very useful chart explaining vcore voltage/frequency - current draw here: https://bitcointalk.org/index.php?topic=1764803.msg17863895#msg17863895

In order to fully take advantage of what this USB miner can deliver, you definitely want powered USB hub with additional current available for each port.

It is over.
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February 21, 2017, 04:00:13 AM
 #597

Very curious to get these and see what is needed, hopefully the software is easy

Really was hoping to have the bigger ones by now Sad

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February 21, 2017, 04:15:48 AM
 #598

Very curious to get these and see what is needed, hopefully the software is easy

Really was hoping to have the bigger ones by now Sad

Biggies?
sidehack
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February 21, 2017, 04:47:46 AM
 #599

Yeah well, I was hoping to have a lot of things by now.

I'll be starting procurement for a second batch of 2Pacs by rolling the profits from this batch forward into materials for the next one so I can pretty much shift seamlessly from one to the next. That's the kind of momentum I wish I'd been able to have with the Compac last year.

I'm looking at buying a new Pick and Place machine, something that'll automate parts placement a lot more efficiently and accurately than the one I have now. Something that'll hold precision a lot better, so the boards coming out of it will require a lot less rework afterward. That's going to be a huge step in being able to manufacture more complex miners quickly - like the Biggie. As soon as I have time I'll work up a prototype, but for now ASICs have to be hand-placed to get them right enough to be reliable. Even on the 2Pacs. But I'm eyeballing a robot with a vision system for proper centering and ball screw carriers for precision, which should help out a lot. The second batch of 2Pacs should put me over the top of buying it, or at least come close. Gonna have another batch of PSU boards to help it out.

Hopefully the Biggie prototype works without a lot of issue. If it does I'll look into batching; it'll require juggling back and forth between Biggie and 2Pac (heh) for a while. Gonna need multiple buttloads of ASICs.

Oh also and I'm pulling out an old USB hub design project. Figured out a better way to do a thing or three I thought would be cool features.

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February 21, 2017, 06:36:24 AM
 #600

Hopefully the Biggie prototype works without a lot of issue. If it does I'll look into batching; it'll require juggling back and forth between Biggie and 2Pac (heh) for a while. Gonna need multiple buttloads of ASICs.

check the @yochdog auction on ebay, maybe he will sell at some discount here.
http://www.ebay.com/itm/Lot-Of-Bitmain-Antminer-S5-/192106981757

lots of disassembly work, though...
99X30=2970 chips, if i am not mistaken in my math.
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