it possible to get the PWM to go lower? If i enter 1%, 5%, 10% there's no noticed difference in volume.
noise isnt bad, about equal to an S3 in a warm room, maybe a tad more 'penetrating'. With the cold air from outside, I can achieve good hashrates with a low fanspeed, but if i could get it 20% quieter at the cost of ~200GH I'd be happy to do so.
Without the cold air from outside, low-rpm is far from sufficient if i am tageting a 55-60C operational temperature
20C (ambient) = 3.6TH
10C = 4TH
5C = 4.3TH
0C = 4.6TH
-5C = 4.8TH (and 0.011% errors, havent pushed further yet)
It is possible to go lower than 20% PWM with my modified bitmain_spi file :
The only modification is that it can go to 10% min instead of 20% min. (You still need to set the fan percentage to what you want : example 18%)
This allows to effectively decrease the noise from the s7 (totally silent if set at 10%) if you are in a very cold ambient temperature or if you downclock the frequency seriously
It should not be used if the temperature is > 70°C. Check that the stop miner when temp is over 80°C box is checked in the configuration page.
Download here :
https://mega.nz/#!8BUVVa7K!pSyaXVVjxfkthPdgJUSabKQQaRiVi1s6-zct5Ob32iMThe original is here if you need it :
https://mega.nz/#!MctVRR7D!lEEb0NvQQNtAemzYNawEAtp8qMVi75dxOLqwNFqv7ToTo use it :
scp bitmain_spi_s7_fan_10.ko
[email protected]:/config/ #Copy the file to the miner
then ssh to the miner :
ssh
[email protected]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_s7_fan_10.ko /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi.ko # Copy the new file to the good place
/etc/init.d/cgminer.sh stop ; /etc/init.d/cgminer.sh start #restart cgminer
The modification will be gone if you restart your miner.
If you want to do it again after a restart you only need to do the two last command :
cp /config/bitmain_spi_s7_fan_10.ko /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi.ko # Copy the new file to the good place
/etc/init.d/cgminer.sh stop ; /etc/init.d/cgminer.sh start #restart cgminer
If my new binaries help you and you are satisfied, consider helping 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 S7 or make it useless ; this could void your warranty with bitmain.
It works! looking at the two files, seems the difference is 2-3 hex values that are modified. The method provided above works, but heres the easy way for those on windows:
CAUTION: comparing the modified file against the original THAT WAS ON MY BATCH 8 shows a large number of differences, as does comparing my original with the "original" file uploaded above. The vast majority of changes seem to be incremental hex values: 4F becomes 4E, 83 becomes 82, 9A becomes 99, etc. not sure why though
SOLUTION: using a site like www.diffnow.com, compare the existing bitmain_spi.ko file with the modified one provided above. If there are only 2-3 changes its safe to change. If Its a batch8 system, Ive made a modified file here: https://mega.nz/#!wAcA3SrZ!2cVcpIR4qjJY2xmFvRREOMlVYFLk6YtzIxQNteGdWe0 (works to 10% fan, and with this the system runs fans at max when changing settings, as it did when stock) (based on this original (S7, B8): https://mega.nz/#!kYdC2bTD!kcBid6lMeN9ygYxJ2sprMhRBmDJ-bwaBO3ldZPCHWiU)
1) download the modified file above.
2) download and run winscp.
3) connect to miner (SCP mode, port 22, root/admin). navigate to folder: /lib/modules/3.8.13/kernel/drivers/bitmain/
4) rename bitmain_spi.ko to bitmain_spi_original.ko
5) transfer the bitmain_spi_s7-fan_10.ko file to that directory, and then rename as bitmain_spi.ko
6) login to the miner's webUI. change fan setting there and "save&apply"
Not sure if changing it this way will survive a reboot, but the process is simple to repeat.
OPTIONAL:
7) copy the bitmain_spi_s7_fan_10.ko file to /config/bitmain_spi_s7_fan_10.ko
if modifications are lost on system restart, SSH in and type:
cp /config/bitmain_spi_s7_fan_10.ko /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi.ko # Copy the new file to the good place
/etc/init.d/cgminer.sh stop ; /etc/init.d/cgminer.sh start #restart cgminer
interesting sidenote, when changing settings in the lanfeusst version, the fan goes quiet, then spins up (before it went full blast, then reduced speed)
