Antminer S5 - Underclock - Undervolt - Best J/GH - page 7.

VirosaGITS

legendary

Activity: 1302

Merit: 1068

Quote from: 1slickvdc on September 26, 2015, 12:32:53 AM

http://www.jameco.com/Jameco/Products/ProdDS/374011.pdf find the column SE-600-12 and go down to "Voltage Adj Range" row. There's a range.

I see, gotcha. A problem someone encountered was that when he went to the lowest range, the PSU went from supporting something like 500W to 100W because the amperage limit also went down with the Volt.

It doesn't seem to say what it will support while at 10V.

1slickvdc

member

Activity: 67

Merit: 10

http://www.jameco.com/Jameco/Products/ProdDS/374011.pdf find the column SE-600-12 and go down to "Voltage Adj Range" row. There's a range.

VirosaGITS

legendary

Activity: 1302

Merit: 1068

Quote from: 1slickvdc on September 26, 2015, 12:27:40 AM

I'm thinking of getting this thing: http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_374011_-1 since it will allow me to adjust voltage level and isn't too expensive nor inefficient. Also, I ran the numbers on my power supply based on the nominal consumption out of the manual at stock speeds. My PSU is running about 77%. Ouch.

How do you find out if you can adjust the voltage? This thing says "Primary Output Voltage (VDC) 12v".

If you really want to fiddle, go ahead, you might want to have a look at which PSU the other user went with for doing this. I think he needed to get 2 5V~ PSU to do 10V~ to keep efficiency and stuff. Hmm.

But it would be a shame if like other user you try to go to 11.5v and then bam it drops and you can't get any effective downvolting from it. I guess in the worse case this could be the unefficient unit and if you make sure the other unit is v1.91 then you'll have the PSU to undervolt it.

1slickvdc

member

Activity: 67

Merit: 10

I'm thinking of getting this thing: http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_374011_-1 since it will allow me to adjust voltage level and isn't too expensive nor inefficient. Also, I ran the numbers on my power supply based on the nominal consumption out of the manual at stock speeds. My PSU is running about 77%. Ouch.

VirosaGITS

legendary

Activity: 1302

Merit: 1068

Quote from: 1slickvdc on September 25, 2015, 11:56:19 PM

Excerpt from the S5 manual:
"Notes: Input voltage should not be less than 12.00V, since it is based on serial power solution and there is no DC/DC inside the miner. Higher input voltage will cause higher mining efficiency."

What the balls? The only possible thought on why they would do that is an attempt to keep heat down. Other than that it sounds like a terrible idea in terms of reliability.

And they also had:

"When better power efficiency is needed in the future due to higher network difficulties, you may want to buy some special PSUs 9V DC with more than 10A output, which will allow you to have a 0.2J/GH mining efficiency, but at lower hashing speed."

So err. Yeah, don't ask.

1slickvdc

member

Activity: 67

Merit: 10

Excerpt from the S5 manual:
"Notes: Input voltage should not be less than 12.00V, since it is based on serial power solution and there is no DC/DC inside the miner. Higher input voltage will cause higher mining efficiency."

What the balls? The only possible thought on why they would do that is an attempt to keep heat down. Other than that it sounds like a terrible idea in terms of reliability.

philipma1957

legendary

Activity: 4326

Merit: 8899

'The right to privacy matters'

some not so good news on s-7 underclocking. using this psu

https://www.trcelectronics.com/ecomm/pdf/hrp600.pdf

okay I set freq to 300 which is half speed and I did 2400gh at 612 watts which is normal volts were at 12.15

I dropped volts to 11.85 2400 gh held watts went just under 600 to 594

I dropped volts to 11.50 2400gh held watts went down to 579

At 11.25 volts asics dropped off

so there is some type of governor/regulator on the early s-7 just like the early s-5.

and to be sure the controller was out of the power line it was run with a different psu steady at 12.15

1slickvdc

member

Activity: 67

Merit: 10

Wait. "string" as in they put the chips in series on the rail?

VirosaGITS

legendary

Activity: 1302

Merit: 1068

Quote from: 1slickvdc on September 25, 2015, 10:49:40 PM

Hash board V1.3 also.

From a low-level sense, there's no reason the chip voltage absolutely couldn't be controlled from the software except by intentional design. Most likely to prevent twits from cranking it up and blowing out their miners. What about a hardware modification? It's a switching supply of sorts to step it down to chip voltage, there's got to be a voltage reference point somewhere that can be modified, eh?

I really don't know the details. Apparently its because they switched to a "string design", the voltage must be controlled at the feed/PSU level. But again only the 1.91v seem to support it without dropping chips.

Maybe RichBC can elaborate on that, but i'm not the guy for that.

1slickvdc

member

Activity: 67

Merit: 10

Hash board V1.3 also.

From a low-level sense, there's no reason the chip voltage absolutely couldn't be controlled from the software except by intentional design. Most likely to prevent twits from cranking it up and blowing out their miners. What about a hardware modification? It's a switching supply of sorts to step it down to chip voltage, there's got to be a voltage reference point somewhere that can be modified, eh?

VirosaGITS

legendary

Activity: 1302

Merit: 1068

Quote from: 1slickvdc on September 25, 2015, 10:14:42 PM

That's why I really want to get the voltage down on that damn supply. The 600W version of that supply has a trim pot and people have dropped it to about 11.6V. My controller board says V1.3 (assuming that's the string that reads something S5 blah FPGA something. The only version number I could find anywhere. On the control board next to where the one hash board connector and the control board power connectors are. The PSU also reads about 35W unloaded.

Can the voltage be modified like my U3's, through editing the config? Saw this in the "monitor" section.

/usr/bin/cgminer --bitmain-dev /dev/bitmain-asic --bitmain-options 115200:32:8:7:200:0782:0725 --bitmain-checkn2diff --bitmain-hwerror --version-file /usr/bin/compile_time --queue 8192 --api-listen --default-config /config/cgminer.conf

one of those "--bitmain-options" params has to be voltage, probably 0782 or 0725.

You can set the option but the hardware doesn't use it. Since it has some string design or some such it doesn't have voltage control.

You can see the board version here on the PCB not the controller;
http://i1079.photobucket.com/albums/w501/bond007taz/20150129_071133_zpsce3ee8cd.jpg

S5_SPOWER_HashBoard_V1.3 is what it read but its quite possible you have a very early batch S5.

1slickvdc

member

Activity: 67

Merit: 10

That's why I really want to get the voltage down on that damn supply. The 600W version of that supply has a trim pot and people have dropped it to about 11.6V. My controller board says V1.3 (assuming that's the string that reads something S5 blah FPGA something. The only version number I could find anywhere. On the control board next to where the one hash board connector and the control board power connectors are. The PSU also reads about 35W unloaded.

Can the voltage be modified like my U3's, through editing the config? Saw this in the "monitor" section.

/usr/bin/cgminer --bitmain-dev /dev/bitmain-asic --bitmain-options 115200:32:8:7:200:0782:0725 --bitmain-checkn2diff --bitmain-hwerror --version-file /usr/bin/compile_time --queue 8192 --api-listen --default-config /config/cgminer.conf

one of those "--bitmain-options" params has to be voltage, probably 0782 or 0725.

VirosaGITS

legendary

Activity: 1302

Merit: 1068

Quote from: 1slickvdc on September 25, 2015, 09:47:38 PM

New to this thread and TL:DR on the rest of it. GITS referred me here and told me to bring some data since I just picked up an S5 and am doing a project for the school with probably two of these things.
All power measurements are made using a Kill-A-Watt meter behind an HP DPS-800GBA power supply, for some odd reason putting out a loaded 12.65V (12.7V unloaded). Hash measurements are from the management screen on the unit's web interface "GH/S(avg)" box after roughly 10 minutes. Temperatures are in a room where ambient temp was high, around 28C, using the stock (incredibly noisy) fan.

Balls, won't let me actually embed the damn thing...

Ouch that is bad efficiency. But most of that is because of the PSU itself so it's hard to say how much of it is due to the voltage. Its interesting still. What PCB version do you have? Its written in top right of the PCB under the bitmain logo.

Anyways basically the interesting point is 400-425, youre able to clock it just a bit higher and stay stable with your over voltage. But you get very bad efficient across the board. The highest i could get was 1315, and then it crash rapidly, while you crash a bit later at high volt. I guess it make sense.

Ultimately you normally would draw 580w at 350 and you're at 700, ouch. Also your efficiency go up and down mine didn't it was a bit better in the account of the the fan draw being the same and actual efficiency being the same.

1slickvdc

member

Activity: 67

Merit: 10

New to this thread and TL:DR on the rest of it. GITS referred me here and told me to bring some data since I just picked up an S5 and am doing a project for the school with probably two of these things.
All power measurements are made using a Kill-A-Watt meter behind an HP DPS-800GBA power supply, for some odd reason putting out a loaded 12.65V (12.7V unloaded). Hash measurements are from the management screen on the unit's web interface "GH/S(avg)" box after roughly 10 minutes. Temperatures are in a room where ambient temp was high, around 28C, using the stock (incredibly noisy) fan.

Balls, won't let me actually embed the damn thing...

VirosaGITS

legendary

Activity: 1302

Merit: 1068

I have little electrical knowledge, so i do not know how to pair up buck converters together to raise the watt limit and keep the efficiency up to 98%. Basically it would be a god send, even if the end cost is 40$ per to keep it running at full speed but with much better efficiency. At least for some users and maybe me if i can get a bunch of the step down for cheap.

Maybe someone with more knowledge could answer as to whether you can pair up a buck converter to raise the watt limit/keep efficiency up?

Also maybe someone can tell us where the S5 hide the image, or the freq list.

flikflak

sr. member

Activity: 408

Merit: 259

I'm using two of those little fellas.

There are some 40A/400-500W buck converters in the shop -> that should be enough for VirosaGITS. I wouldnt connect 2 in parallel to one board, because that would be like 2 different PSUs to one hashingboard.

And yes, its a V1.91. I will do some more tests later.

RichBC

hero member

Activity: 588

Merit: 500

Quote from: VirosaGITS on September 25, 2015, 12:24:47 PM

I think not, you would have to use the table we already have and do try to manually figure out which delay to set with the hex. It is indeed possible that the middle value is literally "just for show".

Since the cgminer use the typical json.config format, there's no need to have a list of code line that you ssh vi edit-freq etc and just #'out the unused line.

I understand what you mean there should be some dictionary for the firmware to automatically change it but i never found it and it might be compiled in the image in boot at start, as such you could try to open image such as cd/mnt/mm1 initramfs.bin.SD for the S4, but for the S5 seem even more elusive. I don't know where it is.

Perhaps someone could elucidate the mystery or give a hint but checking file by file is tedious and i did not manage to find anything relevant. =/

Also for the step down, is it possible to put 2 in parallel or something to allow something like 200w~ per blade? May sound expensive but meh, i'd like something around 11v and i guess if they were adjustable as well it would be a plus, but i don't know how step downs/buck converters work.

I tried editing the line cgminer.conf and if you make any change even a single character then the frequency shown in the drop down menu in Miner Configuration is blank. I only have the control board with me so cannot see if the Miner hashes. Have had a bit of a search for a file with all the values in but no luck so suspect you are right that it is compiled.

Not sure about parallel connecting the converters would be concerned if they would power share?

flikflak nice results, which Buck converters are you using? Have you got a V1.91 hash Board?

Rich

flikflak

sr. member

Activity: 408

Merit: 259

Here are my results with the buck converters:

@175 MHz 10.06 Volts and 580 Gh/s ~215 Watts @ Wall -> 0.371 J/Ghs

So thats 27% less energy.

Despite I've had no HW errors @175MHz there were some @150MHz (100 per hour and less than 0.004%)

So thanks for the ideas to RichBC and all the other great guys.

VirosaGITS

legendary

Activity: 1302

Merit: 1068

Quote from: RichBC on September 21, 2015, 08:22:41 AM

Quote from: VirosaGITS on September 17, 2015, 01:08:35 AM

Quote from: RichBC on September 17, 2015, 12:50:55 AM

As I said the the software is not at all my thing, but I assume there is a file that you can SSH into and edit on the controller board that will have the frequency divider & delay values? Same as there is for the S3?

Rich

Yes. I use WinSCP myself, pretty nice as you can edit everything from your windows computer more normally. Anyhow the json config file is /config/cgminer.conf. Open it and you will see the normal JSON style config.

Relevant line is;
"bitmain-freq" : ""

Example of proper value "bitmain-freq" : "3:393.75:1f06".

Am away from home but took a controller board with me and have just got round to SSH into it. Have found the line you refer to above and as far as i can see the first character "3" is the delay with "3" being around 10mS, this number increases as you drop the frequency and is 10 when you get to 100MHz. Second number "393.75" is the frequency however I think it might just be the text that appears in cgminer? The third Hex number "1f06" is to set up the divider and corresponds to the data in the BM1384 data sheet.

So I think this is where the current selected Frequency and associated setup information for Delay and Divider ratio are stored? So yes editing them will probably allow a different frequency to be set.

However there must also be a file somewhere which has the complete table of frequencies and with access to that an additional Frequency, Delay and Divider Ratio could be inserted which would then allow selection from within cgminer?

Question is does anyone know where this table is?

Rich

I think not, you would have to use the table we already have and do try to manually figure out which delay to set with the hex. It is indeed possible that the middle value is literally "just for show".

Since the cgminer use the typical json.config format, there's no need to have a list of code line that you ssh vi edit-freq etc and just #'out the unused line.

I understand what you mean there should be some dictionary for the firmware to automatically change it but i never found it and it might be compiled in the image in boot at start, as such you could try to open image such as cd/mnt/mm1 initramfs.bin.SD for the S4, but for the S5 seem even more elusive. I don't know where it is.

Perhaps someone could elucidate the mystery or give a hint but checking file by file is tedious and i did not manage to find anything relevant. =/

Also for the step down, is it possible to put 2 in parallel or something to allow something like 200w~ per blade? May sound expensive but meh, i'd like something around 11v and i guess if they were adjustable as well it would be a plus, but i don't know how step downs/buck converters work.

RichBC

hero member

Activity: 588

Merit: 500

Quote from: VirosaGITS on September 17, 2015, 01:08:35 AM

Quote from: RichBC on September 17, 2015, 12:50:55 AM

As I said the the software is not at all my thing, but I assume there is a file that you can SSH into and edit on the controller board that will have the frequency divider & delay values? Same as there is for the S3?

Rich

Yes. I use WinSCP myself, pretty nice as you can edit everything from your windows computer more normally. Anyhow the json config file is /config/cgminer.conf. Open it and you will see the normal JSON style config.

Relevant line is;
"bitmain-freq" : ""

Example of proper value "bitmain-freq" : "3:393.75:1f06".

Am away from home but took a controller board with me and have just got round to SSH into it. Have found the line you refer to above and as far as i can see the first character "3" is the delay with "3" being around 10mS, this number increases as you drop the frequency and is 10 when you get to 100MHz. Second number "393.75" is the frequency however I think it might just be the text that appears in cgminer? The third Hex number "1f06" is to set up the divider and corresponds to the data in the BM1384 data sheet.

So I think this is where the current selected Frequency and associated setup information for Delay and Divider ratio are stored? So yes editing them will probably allow a different frequency to be set.

However there must also be a file somewhere which has the complete table of frequencies and with access to that an additional Frequency, Delay and Divider Ratio could be inserted which would then allow selection from within cgminer?

Question is does anyone know where this table is?

Rich

Topic: Antminer S5 - Underclock - Undervolt - Best J/GH - page 7. (Read 31123 times)