undervolt antminer s3

[nreal]

So im not sure how the voltage should be applied 0.55 or .55 or .55v - is there a way to check that is does something? .55v 218mhz and iget 0.01% hw. Those have burned alot electricity for nothing and keeped some noice too...

[clizity]

SSH in to the unit and run this cmd
vi  /etc/config/cgminer
this is the location that the new FM uses to store pools, freq, time out, volt, ect.

vi /etc/asic-freq is no longer used
\

you have to set volts in the GUI first before it shows in the config file.

[clizity]

ok so i went all the way up to 1.00 for the volts and 250 on the clock. it spiked up to 611.72 GH/s but is up and down. ran 16 min with 1 HW error. fans are 2,400 and 2,100. temp 41 and 37    all on room air.   

 i live in hotel rooms so i travel with 2 antminer s3+ free electric. ill get these two in the A/C server room this weekend and see how far i can push them.

[neegeeboo]

ok so i went all the way up to 1.00 for the volts and 250 on the clock. it spiked up to 611.72 GH/s but is up and down. ran 16 min with 1 HW error. fans are 2,400 and 2,100. temp 41 and 37    all on room air.   

 i live in hotel rooms so i travel with 2 antminer s3+ free electric. ill get these two in the A/C server room this weekend and see how far i can push them.

that's alot to lug around    Please tell us how it goes.  Do you have a way to measure how much power it draws?

[clizity]

ill put a report together on this. i have a water meter at the wall 1 PSU and 2 s3+

i have a DC what meter on order right now. so every thing i post right now just a estument.

right now i see at 10 watt swing with ambent temp. so he need to keep them cool for lower power use

miner #2 was not stable at 250 & .80 had to retard it to 243 to be stable but i and only testing volts right now and then will test clock

250 & .08 / 499.46 491.01 ghs / 834 watts / 7.19 amps

ill minn in large chunks to get good averages and use 2 minners to rule out defects in asic chips.

[clizity]

i have some antminer s3

but i only have 3000W to mining

i need to have max efficiency

3000w/120volts=25amps
keep in mind that as you volts drop you watts go down and amps go up

curently at my house i get 117 volts. a good idea would be to put a volt meter on your plug to see what you volts are at different times of the day and different days.

117v * 25 amps = 2925 watts
115v * 25 amps = 2875 watts

do you have a 25 amp beaker. that seams odd. residential is usealy 15 or 20???

[Pinz]

i have some antminer s3

but i only have 3000W to mining

i need to have max efficiency

3000w/120volts=25amps
keep in mind that as you volts drop you watts go down and amps go up

curently at my house i get 117 volts. a good idea would be to put a volt meter on your plug to see what you volts are at different times of the day and different days.

117v * 25 amps = 2925 watts
115v * 25 amps = 2875 watts

do you have a 25 amp beaker. that seams odd. residential is usealy 15 or 20???

Sounds like they are from Europe (Portugal?) where the voltage is 240V, so that would be only 12 Amps.

By the way, where do I find what the stock voltage is?

[clizity]

good point on the 240. if so lucky them. thing run better at the higher voltage. 

i have not found a refferance to the defult voltage.

in the  /etc/config/cgminer the last line is blank but after putting in a voltage on the GUI it is added as the last line.   no line default voltage. what that is ?   not sure currently trying to reverse engineer this thing but work is getting in the way

https://bitmaintech.com/files/download/BM1382_Datasheet_v3.0.pdf
page 3 shows the chip speck

[clizity]

clock   volts   hash 1   hash2   hash total   watts   wats per hash      units on 3kw      test    test hash
250   0.6   493.19   466.44   959.63   839   0.874295301      7.151370679      7   3358.705
250   0.7   497.31   486.55   983.86   847   0.860894843      7.083825266      7   3443.51
250   0.8   499.46   491.23   990.69   836   0.843856302      7.177033493      7   3467.415
                                 
200   0.7   397.99   399.31   797.3   645   0.808980309      9.302325581      9   3587.85
100   0.7   213.2   190.19   403.39   325   0.80567193      18.46153846      18   3630.51

[clizity]

okay so just messing with adjusting the voltage of the ASIC chips my results are all over the place and I think I know why.at this point I'm assuming on the architecture of how the device functions but if I was building a cheap control system for voltage I would use some sort of processor to send out a control signal such as pulse width modulation or a 1 to 5 voltage as a referenceto some sort of voltage regulator. This appears to be the case if looking at the ASIC blades. There are several banks of voltage regulators leading down the card to several groups of chips looking at thisI have to assume that it's an open loop voltage control system. Meaning there is not feedback from each individual voltage regulator to allow the control system to know whether it's too high voltage or too low voltage and then adjust appropriately. Therefore I have to assume setting a voltage in the firmware is not precise control of the voltage to each individual ASIC chip. Also if you look at the design the board is laid out from left to right or right to left depending on how you look at it. This means the intake air comes in on one side of the board and then exits on the opposite side of the board therefore the temperatures across all these voltage regulators will vary greatly.  temperature differences will make voltage regulators drift in their output voltage. After observing this it would be my recommendation 2 leave the voltage at stock or to set it at the midway point. Setting it at the midway point would put the chips in the center at the midway point the chips at the inlet. At a lower voltage and the chips at the highest temperature location next to the exit at the highest point. By averaging all these together you would get a average efficiency across all the chips.

for the rest of my testing I set the voltage to. 7 volts. I was able to get a higher wattage efficiency out of the units by adjusting the clock more so than adjusting the voltage I attached a copy of some data I produced during these tests above.

by keeping units pretty well stock it appears that he can only fit about 7 units on a 3 kilowatt circuit.you can get the chip efficiency up by decreasing the clock but by decreasing the clock your overall hashrate decreases but efficiency increases. At the most efficient. With a clock of 100 he can place 18 minors on a 3000 watt circuit this would give him a higher overall hashrate than just using 7 miners at stock but would only lead to about 200 more Giga hashes. His return on investment would be ridiculous. Even adjusting the clock to 200 he could add 9 units to the circuit and would gain approximately a hundred and fifty more Giga hashes but with the price of ant miners he would be adding 600 to 700 more dollars to his setup which is just not a good return on investment.

I think the best way to optimize these units would be to set them up default and then increase the clock until you start seeing errors then decrease the clock so you don't get errors. Hardware errors in this scenario will lead 2 more wasted watts due to the fact units having to redo calculations.

I did observe that with higher temperatures the hash rate begins to decrease I was able to prove this by blocking the vents and watching my hash rate dropped by about a hundred Giga hashes. Therefore I have to assume that a more effective way of increasing efficiency would be to keep these units as cool as possible. Sometime in the future I will start experimenting with supercooling these units by using A heat exchanger inside of a 4 inch pipe feeding into the units. I will also try experimenting with other ways to cut wattage off of the units. I'm starting to think there are a lot of wasted wats inside of the circulation fans. Example would be that your power supply is not 100% efficient and DC motors are not the most efficient either therefore I have to assume y would you use clean power to run DC fans. I will attempt to remove the fans and replace them with AC units in an attempt to he could increase efficiency.so far I've been able to get objects up to a hundred degrees by just using the exhaust air on these units. Which leads me to think we may be able to reclaim wattage with the use of a device such as a thermal electric generator.

I will continue to try to work on my units to make them the most efficient as possible in my spare time its in my best interest to do so because I plan on being independently rich using Bitcoin miners.until then donations are greatly appreciated to help further my research which I will continue to share with everyone on the post form. When I get something new I will post it in this post forum as well as maybe make a new post.

16readkuKHgLPo7ii24VxVstJtM3VnRPrn

[lulu2003]

regarding to the new Miner configuration setting in Oct.2014 Firmware I did not find too much with search.

do these voltage settings really apply? I doubt.

stock it has voltage numbers like 0725. is it really = 0.725V?
Which steps are supported? for me it's not always plausible when I check the watt meter. changing in volts do not change watts.

e.g.

0.65V  150M = roughly 300GH/s = 235Watt at the wall (normal 80plus PSU)
0.50V  150M = same 300 GH/s and same 235W
0.50V  175M =  350GH sucking 270W from wall and being louder

 

HW errors = zero

Are there some more steps to apply in between given frequencies with editing some config files in the files system?

BTW: asymmetrical S3:

Code:

Chain#	ASIC#	Frequency	Temp	ASIC status
1 16 175  39 oooooooo oooooooo
2 16 175  35 -ooooooo oooooooo

[jjiimm_64]

With the new antMiner_S320141013 update on Bitmain's website you can easily modify the voltage under "miner configuration" then "advanced settings". I have played around with .63v but I get more hw than I would like. A voltage of .72v at 243.7mhz gives me a solid 490gh/s while using about the same wattage as stock.

Are you doing this with the s3 or s3+?  Do you know if there is a difference?

Nope, there isnt.

Most of my S3's do NOT have the advanced tab for freq/volts.  some have the advanced tab with only freq.  only the last 5 s3's i bought this week have the volt section under the freq. 

Can the older s3's but upgraded to do the volts thru the gui?,  can the older s3's be volted via ssh?

[neegeeboo]

With the new antMiner_S320141013 update on Bitmain's website you can easily modify the voltage under "miner configuration" then "advanced settings". I have played around with .63v but I get more hw than I would like. A voltage of .72v at 243.7mhz gives me a solid 490gh/s while using about the same wattage as stock.

Are you doing this with the s3 or s3+?  Do you know if there is a difference?

Nope, there isnt.

Most of my S3's do NOT have the advanced tab for freq/volts.  some have the advanced tab with only freq.  only the last 5 s3's i bought this week have the volt section under the freq. 

Can the older s3's but upgraded to do the volts thru the gui?,  can the older s3's be volted via ssh?

Yes.  You can get the latest firmware from the bitmain site.

[jjiimm_64]

regarding to the new Miner configuration setting in Oct.2014 Firmware I did not find too much with search.

do these voltage settings really apply? I doubt.

stock it has voltage numbers like 0725. is it really = 0.725V?
Which steps are supported? for me it's not always plausible when I check the watt meter. changing in volts do not change watts.

e.g.

0.65V  150M = roughly 300GH/s = 235Watt at the wall (normal 80plus PSU)
0.50V  150M = same 300 GH/s and same 235W
0.50V  175M =  350GH sucking 270W from wall and being louder

 

HW errors = zero

Are there some more steps to apply in between given frequencies with editing some config files in the files system?

BTW: asymmetrical S3:

Code:

Chain#	ASIC#	Frequency	Temp	ASIC status
1 16 175  39 oooooooo oooooooo
2 16 175  35 -ooooooo oooooooo

I have not tested it yet.. but if the wattage measured at the wall does not change, then the voltage did NOT apply

[jjiimm_64]

changing the voltage does NOT appear to change the wattage at the wall...  wtf?

[neegeeboo]

changing the voltage does NOT appear to change the wattage at the wall...  wtf?

Does anyone else have anymore ideas on how to get the S3 to become more energy efficent? 

[lulu2003]

I think you have to disassemble the s3 and apply pencil mod to undervolt like s1.
It was described here somewhere in the threads. But the gain was obviously not like s1.
the voltage input field in the latest s3 firmware is very likely an error, my own tests did not show results on the wall and I have not found a single postive result via google...

[SunnyIgor]

Is there a setting with the new firmware to make the S3 more energy efficent?
Does changing the voltage and frequenty lead to better power efficiency.
I need to make some room in my farm for 2 S5's and only have 4 kw.

[untenops]

Just throwing this out there.  Bitmain mentions running the S5s with a 9 volt PSU for better efficiency.  Has anybody tried this on a S3?  Would it be possible?  Would be nice if we could just plug in a 9 volt PSU without having to do any internal mods to the S3s.  Of course I dont know whats required to run the S5s on 9 volt either. 

[lulu2003]

Is there a setting with the new firmware to make the S3 more energy efficent?
Does changing the voltage and frequenty lead to better power efficiency.

No!
the voltage field is obviously without any function.

Same as the S5, it also has no voltage settings.

If you find a 9V PSU either 400W or 600W with good eta (pls show me), you will probably get the S3 oder S5 to work with better efficiency.