Bitcoin Forum

Hi guys,
After hard work at trying to understand how the antminers S4 fans works (40 hours of my time) , I have finally been able to change the S4 fan speed by changing software.  :) This allows to effectively  decrease the noise from the s4 AND to decrease the power consumption by a maximum of 100 watts (expect 30-50 watts).
It should not be used if the temperature is > 55°C. Check that the stop miner when temp is over 80°C box is checked in the configuration page.

If this helps you, consider my bitcoin address :
1NfUptoShEtSD2SQV2f45Xr1bTysFnsHiU

I have modified the bitmain_spi.ko file into two others binaries which gives differents fan speed.

First version with lower fan speed:

Download here :  
 https://mega.co.nz/#!oEUiwSqQ!_HLU1elXd1YHoNoJDO_FRPrsryGSIrZBzbqTReAp1Mg (https://mega.co.nz/#!oEUiwSqQ!_HLU1elXd1YHoNoJDO_FRPrsryGSIrZBzbqTReAp1Mg)
Result :
http://s28.postimg.org/q48idyma1/Capture_du_2014_11_26_19_10_38.jpg (http://postimg.org/image/q48idyma1/)

Second version with much lower fan speed: it should not be used if the temperature is > 55°C. Check that the stop miner when temp is over 80°C box is checked in the configuration page.

Download here :
https://mega.co.nz/#!UQknnAAT!tAkOkbojWlEkP_NTVB7czJQC3wFs1BD9duK4UWIhJG0 (https://mega.co.nz/#!UQknnAAT!tAkOkbojWlEkP_NTVB7czJQC3wFs1BD9duK4UWIhJG0)
Result:
http://s28.postimg.org/562cfvmfd/Capture_du_2014_11_26_19_11_11.jpg (http://postimg.org/image/562cfvmfd/)
The original is here if you need it :
https://mega.co.nz/#!NJtxUToZ!KyTOlad--U1JTddV9sq0XdqBhqygmdIZ0ulV1iLuooA (https://mega.co.nz/#!NJtxUToZ!KyTOlad--U1JTddV9sq0XdqBhqygmdIZ0ulV1iLuooA)

To use it :
Change 192.168.0.16 with the Ip address of your miner


scp bitmain_spi_fan_6.ko root@192.168.0.16:/config/           #Copy the file to the miner

then ssh to the miner :
ssh root@192.168.0.16
then :
cp /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi.ko /config/bitmain_spi_original.ko        #Makes a backup
cp /config/bitmain_spi_fan_6.ko /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi.ko         # Copy the new file to the good place
cd /etc/init.d/ #Change directories
./cgminer.sh stop         # Stop cgminer
#Wait 1 seconde
./cgminer.sh start        # Start cgminer
#Wait 30 secondes

Check the web page at 192.168.0.16, you should be able to see the new lower fan speeds :)

I did not do that for free   ;)  ; if my new binaries help you and you are satisfied, help me by sending some bitcoins to my address:
1NfUptoShEtSD2SQV2f45Xr1bTysFnsHiU

Warning: Do nothing you don't understand ; No warranties whatsoever are given by me ; this could not work or be useless ; this could burn your S4 or make it useless ; this could void your warranty with bitmain.

Нет, в виндовой командной строке нет ssh, придётся что-нибудь загружать, например putty.