[GUIDE] Undervolt antminer s1 [1.19W/GH at the wall]

[sebdude420]

Thank you Bitmain for releasing some good values to work on!

I'm going to get this done ony remaining S1s

[allcoinminer]

This guideline is for under clocking modification to get 1W/GH/s. In order to get 1W/GH/s, you shall modify the hardware and software.

1 Hardware Modification

1.1 Resistor Typical Value
Package Type: 0603


1.2 Power Consumption and Hash Rate


1.3 How To Modify
Step 1: Remove the existing components: R3, R66, R38, R52.
Step 2: Refer to Resistor Typical Value to replace the R3, R66, R38, R52.
Step 3: Clear the excess of rosin and solder tin slag around resistors.

1.4 Refer to below locations to do modification


2 Software Modification

2.1 Connection Miner
Though SSH protocol on your PC to connect S1, user name and password are ‘root’ by default. Then modify ‘freq_value’, ‘chip_freq’ and ‘timeout’ in the etc/config/asic-freq file.

2.2 Modification Value
2.2.1 200M*8*32*2 = 102.4GHash:
        

Code:

option 'freq_value'     '0781'  #200M
        option 'chip_freq'      '200'
        option 'timeout'        '60'

2.2.2 225M*8*32*2 = 115.2GHash:
        

Code:

option 'freq_value'     '0881'  #225M
        option 'chip_freq'      '225'
        option 'timeout'        '55'

2.3 Restart Miner
Power off and restart Miner, check the configuration via Web GUI ‘Miner Status’. If the Miner doesn’t work normally, please double confirm the correction of frequency configuration file.

Yummy need to know the Power@Walls.

[allcoinminer]

Thank you Bitmain for releasing some good values to work on!

I'm going to get this done ony remaining S1s

Can't wait to see your output.

[philipma1957]

they could put the resistors in and sell the modded ones as s-1A's

low power model.  

better yet they could put in 8 pots 3k ohm to 4.47k ohm  and  sell them as adjustable models

[klondike_bar]

they could put the resistors in and sell the modded ones as s-1A's

low power model.  

better yet they could put in 8 pots 3k ohm to 4.47k ohm  and  sell them as adjustable models

ones with pots would be great - I would like to see them release a more compact 'S1A' with slightly smaller heatsinks closer together and an initial 150GH/200W spec. This could drop the costs slightly and handle the first small undervolting step for the consumer

[allcoinminer]

they could put the resistors in and sell the modded ones as s-1A's

low power model.  

better yet they could put in 8 pots 3k ohm to 4.47k ohm  and  sell them as adjustable models

ones with pots would be great - I would like to see them release a more compact 'S1A' with slightly smaller heatsinks closer together and an initial 150GH/200W spec. This could drop the costs slightly and handle the first small undervolting step for the consumer

I don't believe they will come out with such an exclusive run down version of Ant S1. I'm waiting for their new generation hardware announcement.

[klondike_bar]

they could put the resistors in and sell the modded ones as s-1A's

low power model.  

better yet they could put in 8 pots 3k ohm to 4.47k ohm  and  sell them as adjustable models

ones with pots would be great - I would like to see them release a more compact 'S1A' with slightly smaller heatsinks closer together and an initial 150GH/200W spec. This could drop the costs slightly and handle the first small undervolting step for the consumer

I don't believe they will come out with such an exclusive run down version of Ant S1. I'm waiting for their new generation hardware announcement.

depends how far off the next gen is. If its still a month or two away it may serve bitmain well to release a slightly undervolted version of the S1 in order to keep competitive in poth price and efficiency.

I 'know' i cna undervolt my antminers when the time comes (very soon), but i really dont look forwards to repeating the process 16 times...

[philipma1957]

they could put the resistors in and sell the modded ones as s-1A's

low power model.  

better yet they could put in 8 pots 3k ohm to 4.47k ohm  and  sell them as adjustable models

ones with pots would be great - I would like to see them release a more compact 'S1A' with slightly smaller heatsinks closer together and an initial 150GH/200W spec. This could drop the costs slightly and handle the first small undervolting step for the consumer

I don't believe they will come out with such an exclusive run down version of Ant S1. I'm waiting for their new generation hardware announcement.

depends how far off the next gen is. If its still a month or two away it may serve bitmain well to release a slightly undervolted version of the S1 in order to keep competitive in poth price and efficiency.

I 'know' i cna undervolt my antminers when the time comes (very soon), but i really dont look forwards to repeating the process 16 times...

well if coins creep past 700 usd   undervolting   gets put off   a month.

[allcoinminer]

they could put the resistors in and sell the modded ones as s-1A's

low power model.  

better yet they could put in 8 pots 3k ohm to 4.47k ohm  and  sell them as adjustable models

ones with pots would be great - I would like to see them release a more compact 'S1A' with slightly smaller heatsinks closer together and an initial 150GH/200W spec. This could drop the costs slightly and handle the first small undervolting step for the consumer

I don't believe they will come out with such an exclusive run down version of Ant S1. I'm waiting for their new generation hardware announcement.

depends how far off the next gen is. If its still a month or two away it may serve bitmain well to release a slightly undervolted version of the S1 in order to keep competitive in poth price and efficiency.

I 'know' i cna undervolt my antminers when the time comes (very soon), but i really dont look forwards to repeating the process 16 times...

@628 and higher prize will keep us from doing the mod. Let it continue. Atlast I will put a pot.

[DimensionsOfHell]

they could put the resistors in and sell the modded ones as s-1A's

low power model.  

better yet they could put in 8 pots 3k ohm to 4.47k ohm  and  sell them as adjustable models

ones with pots would be great - I would like to see them release a more compact 'S1A' with slightly smaller heatsinks closer together and an initial 150GH/200W spec. This could drop the costs slightly and handle the first small undervolting step for the consumer

I don't believe they will come out with such an exclusive run down version of Ant S1. I'm waiting for their new generation hardware announcement.

depends how far off the next gen is. If its still a month or two away it may serve bitmain well to release a slightly undervolted version of the S1 in order to keep competitive in poth price and efficiency.

I 'know' i cna undervolt my antminers when the time comes (very soon), but i really dont look forwards to repeating the process 16 times...

well if coins creep past 700 usd   undervolting   gets put off   a month.

I'm in the same boat with you. Hopefully the price keeps going up, then I won't have to worry about undervolting for awhile more. The only reason I wanted was so that I could add more hardware, but if the price keeps going up, I won't have to worry about adding new hardware for another month or two.

Oh in ref to the fan I was mentioning earlier; I forgot to mention that I put in a little dab of hot glue on the frame where the fan would be, that gives it a bit of a gap (basically using it as spacers) so I can use the two screws I took off the original fan, that way I avoid the fan blades hitting the little screws there are there.

[Trends]

Added link to my pictures of the 10k pot addition to S1's.


http://imgur.com/a/8SUO8





It would be best if you are going to just change out the resistor to put in a 10K pots!
Then when BTC is worth $1000 or so you can just crank the S1 back up to 200Gh without more hardware changes.

[philipma1957]

Added link to my pictures of the 10k pot addition to S1's.


http://imgur.com/a/8SUO8





It would be best if you are going to just change out the resistor to put in a 10K pots!
Then when BTC is worth $1000 or so you can just crank the S1 back up to 200Gh without more hardware changes.

You could do a side business   s-1 mods.   you need coins to drift upwards at the correct pace. 

[Brassguy]

Added link to my pictures of the 10k pot addition to S1's.


http://imgur.com/a/8SUO8





It would be best if you are going to just change out the resistor to put in a 10K pots!
Then when BTC is worth $1000 or so you can just crank the S1 back up to 200Gh without more hardware changes.

Even with the price rising I'm going to do the pots... In my case I'm going to throw 5K pots on... I just don't have to turn them down right away Thanks Trend for the pics!

[Trends]

According to Bitmain their chip voltage range is 0.75V to 1.20V.
To achieve this range you need ~3.2 ohms to ~9.7 ohms (I don't have my calc's with me but these values are very close)

[Brassguy]

Yeah, I don't want to test the higher end. Mine are at 4.47 (give or take) currently. I'll only be in the 4.47k to 3.2k range
or lower... edit... I'm a dumbass... 5K pots turned all the way up are going to result in too low resistance to hit the lower voltages?

[philipma1957]

Yeah, I don't want to test the higher end. Mine are at 4.47 (give or take) currently. I'll only be in the 4.47k to 3.2k range
or lower... edit... I'm a dumbass... 5K pots turned all the way up are going to result in too low resistance to hit the lower voltages?

0k to 5k pot is common to find.

my guess is cranked to 5k you could achieve 220gh  at 450- 460 watts on  a good plat psu with extra cooling.


while lowered to 3k you can do 140gh at 175 watts>>>  i did this one one of mine.

I would love for all my s-1's to have a 0k to 5k pot  or better yet a 2.5k to 5k dial in option.

   2.5k would prevent too low and 5k would prevent too high

[Biodom]

Yeah, I don't want to test the higher end. Mine are at 4.47 (give or take) currently. I'll only be in the 4.47k to 3.2k range
or lower... edit... I'm a dumbass... 5K pots turned all the way up are going to result in too low resistance to hit the lower voltages?

0k to 5k pot is common to find.

my guess is cranked to 5k you could achieve 220gh  at 450- 460 watts on  a good plat psu with extra cooling.


while lowered to 3k you can do 140gh at 175 watts>>>  i did this one one of mine.

I would love for all my s-1's to have a 0k to 5k pot  or better yet a 2.5k to 5k dial in option.

   2.5k would prevent too low and 5k would prevent too high

I have never done anything like this, so a few questions from a newb:
1. My understanding that for undervolting as per bitmain scheme, I will be removing R3, etc. resistors, but then instructions are a bit thin for me…Do I put something else in place? bitmain says: refer to resistor value to replace. This is where I don't understand. I have to replace R3 and 7 other resistors (8 total, 4 on each board) with what?
2. how POTs came into this? Is it a POT I have to put in place of removed resistors, or is it optional and I can simply put a small droplet of tin where resistor (R3, etc) was?

Thanks

[Trends]

If you ever wanted to get back to "stock 180GH" your pot would have to go up to 8.2Kohms which puts you at 1.12 -1.13 V at the chip.
5K ohm will only get you up to 0.9 to 0.92 V at the chip.
0- 10K are just as common as 0-5K and both are priced the same at $0.40 - $0.70ea
If you're going to play, play right.

[Trends]

Yeah, I don't want to test the higher end. Mine are at 4.47 (give or take) currently. I'll only be in the 4.47k to 3.2k range
or lower... edit... I'm a dumbass... 5K pots turned all the way up are going to result in too low resistance to hit the lower voltages?

0k to 5k pot is common to find.

my guess is cranked to 5k you could achieve 220gh  at 450- 460 watts on  a good plat psu with extra cooling.


while lowered to 3k you can do 140gh at 175 watts>>>  i did this one one of mine.

I would love for all my s-1's to have a 0k to 5k pot  or better yet a 2.5k to 5k dial in option.

   2.5k would prevent too low and 5k would prevent too high

How are you going to achieve 220gh  at 450- 460 watts with a 5K pot or resistor? The stock R3, 66, 38, 52 resistors are 8.2K which give a voltage of 1.12-1.13VDD at the chip (check the S1 schematics or the BOM).
Turn the pencil you used for the pencil mods around and use the rubber to erase your calculations

[stevehoppy]

Wish I had a clue about any of this to be honest.
I've read this thread in full now and my head is spinning!!

I have NEVER done any electrical work or soldering - does anyone here live in the UK and fancy doing this for me in exchange for a few £'s lol?
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