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Hi,i'm Rickey,We meet again.This time, I need give my S1 a minor operation,in order to let it work for another 3 month.
Specific methods:Modify some resistance to reduce chip voltage and frequency.While hashrate reducing,power consumption will be significantly reduced.

Q&A

Q:Why don't you directly reduce the frequency?

A:No, if only to reduce the operating frequency and does not modify the resistance,chip voltage does not change,power
consumption will not be much reduced.

(for example:When frequency is at 381.25 Mhz,S1's hashrate is about 195G with 390w consumption.If you do not modify the resistance,but just reduced to 200 Mhz frequency,probably hashrate is only 100G left but only reduce 60w consumption.)

Q:The power is reduced but hashate is also much lower,so what is the significance?

A:Our purpose is to reduce the power ratio,that means your miner will be more efficient.After testing:the modified S1 can run at 225Mhz frequency with 115G hashrate,the consumption is only about 115w.Power ratio is about 1W/G.

How to do it:

1.Here is a S1's hashboard.I pasted heatsinks on the chip.

131617weepee6lpsaied6p.jpg

131559z3rz3kvur9vczjtk.jpg

2.We need tools like:

  1.Electric iron
  2.Solder
  3.Chip resistor:3.24KΩ±1% 0603 mode
  4.Patient&Carefully

3.There are 4 of resistance need to be replaced on each hashboard.(R3,R66,R38,R52)

131634m04c98c9k5hx4cx5.jpg

131643yegnoea9oeoeymxe.jpg

131711lv925h769zesh376.jpg

131737z1v1b1b9x3261rqn.jpg

4.The size of the resistance smaller than a grain of rice.

131755wqv0z2vviq7l2tv5.jpg

131811qgczkl9xmx7a8za4.jpg

Before i replaced R3,like this:

131848yut4skk1keu0oshs.jpg

After replaced:

131908md4kplexoedu3076.jpg

So you need do the same thing on R66,R38,R52

5.After all of these,The hashboard and heatsink should be assembled together.

131824qmcznkmgkfg0mmgg.jpg

6.Finally,i received S1 control board.

131950saaoargodrqdbddw.jpg

7.Connect the power and network cable.

132006hhl7719nl3sl179z.jpg

132019vzrvug57veqvrtrz.jpg

Test:

I first tested the 193 Mhz and 200 Mhz frequency,but the hashrate is 0!Then i tested 150 Mhz and 175 Mhz,it worked.I had no choice but to change 3.24KΩ resistance for 4.02KΩ resistance.Re-energized test it really worked  under 200Mhz frequency.At this time the hashrate reached about 100G.(225 Mhz@115G)

Before modify:381.25 Mhz @195G,390w consumption.

132029ojx1yu39kkb5fhi4.png

132049y826n6mnsbm9id4t.jpg

After modify:225 Mhz@115G,146w consumption.(PSU not 80PLUS GOLD).It's about 1.26w/G.

132100ew7m107x1nbcynzy.png

132753smteetpylz1lym6y.jpg

---------------------------- ---------------------------- ---------------------------- ----------------------------
Here is the different frequency settingsyou should modify /etc/config/asic-freq file)

01            option 'freq_value'    '0881'  #225M
02            option 'chip_freq'     '225'
03            option 'timeout'       '55'  
04                                                
05            #option 'freq_value'    '0781'  #200M
06            #option 'chip_freq'     '200'
07            #option 'timeout'       '60'
08
09            #option 'freq_value'    '4f02'  #193M
10            #option 'chip_freq'     '193'
11            #option 'timeout'       '70'
12            
13            #option 'freq_value'    '0681'  #175M
14            #option 'chip_freq'     '175'        
15            #option 'timeout'       '80'

Source:http://www.cybtc.com/thread-11251-1-1.html
Author:Rickey
Donations:
BTC:1QiqijiE3emnBtG2FSgfs3zU46uRNZtGc
LTC:LQiqijiQy2KQzqwuVHHHUKjmphQ1A3NRxh

Translators:chuanwc
Donations:
BTC:12hFjmvSTWAJtA3QKUJirma1xgSrp8372E
DOGEGWW7ocPkcjKzvoM8UBjDysQYbXjepxbPD

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