How To Overclock Your S9/T9+,T9,R4 To 18TH/s Free.

[renepickhardt]

I have not been able to underclock my T9+ with the supposed settings that were suggested here but playing around with the ideas from here I found a solution that I wanted to post / share.

So the problem was that that my miner also already had autotuning available and changing "bitmain-freq": "some_value" would be ignored after rebooting.

So first I recognized using top that there was a process /usr/bin/bmminer --version-file /usr/bin/compile_time --api-listen --default-config /config/bmminer.conf running.

Thus I checked /usr/bin/bmminer --help to recognize that there is an option --fixed-freq        Set bitmain miner use fixed freq which probably could also be set in /config/bmminer.conf.

Thus I added the line "fixed-freq":true, to the bmminer.conf so that in total it looked like that:

Code:

{
"pools" : [
{
"url" : "",
"user" : "",
"pass" : ""
}
]
,
"api-listen" : true,
"api-network" : true,
"api-groups" : "A:stats:pools:devs:summary:version",
"api-allow" : "A:0/0,W:*",
"fixed-freq" : true,
"bitmain-fan-ctrl": true,
"bitmain-fan-pwm": "50",
"bitmain-use-vil" : true,
"bitmain-freq" : "300",
"bitmain-voltage" : "0706",
"multi-version" : "1"
}

In this way I was able to underclock the miner and tune down the fan. actually the PSU is now more noise as it's fan cannot be regulated by the software (what a pitty because it still produces 50db).

running the following firmware:

Code:

Miner Type	Antminer T9+
Hostname	miner2
Model	GNU/Linux
Hardware Version	16.0.1.3
Kernel Version	Linux 3.14.0-xilinx-ge8a2f71-dirty #82 SMP PREEMPT Tue May 16 19:49:53 CST 2017
File System Version	Wed Nov 15 17:18:06 CST 2017
Logic Version	T9+_V2.40
BMminer Version	2.0.0

[thierry4wd]

Hi, yes is good méthode, working for the voltage to ! If you have set 300mhz, replace 0706 by 790mv, on all m'y test 790mw IS lower value stable... Make 790mv and you see you low power and lower temp !

If you interessed, i have make specialy patch for S9 and T9+, juste make --fix-freq and New miner configuration page , full free

PS : Kano, i have Big respect for you, but now you see again, don't need modify bmminer or cgminer for make this tweak

[Keezasa]

Would these changes work for the antminer S9se?

Code:

"api-listen" : true,
"api-network" : true,
"api-groups" : "A:stats:pools:devs:summary:version",
"api-allow" : "A:0/0,W:*",
"bitmain-fan-ctrl" : true,
"bitmain-fan-pwm" : "60",
"bitmain-use-vil" : true,
"bitmain-freq" : "O",
"bitmain-voltage" : "950"

Current Frequency is 458. My changes:

Code:

"bitmain-fan-ctrl" : true,
"bitmain-fan-pwm" : "60",
"bitmain-use-vil" : true,
"bitmain-freq" : "400",
"bitmain-voltage" : "850"

[renepickhardt]

If you have set 300mhz, replace 0706 by 790mv, on all m'y test 790mw IS lower value stable... Make 790mv and you see you low power and lower temp !

what is the relationship between frequency and voltage? Also how directly does it relate to the power consumption? I tried to find information about such things but the web has too many documents discussing other stuff but using these words so search engines are net helpful. Would be really grateful for some hints / pointers or explaination as I am obviously trying to find a sweetspot of low enegery consumption and less noise fan speed.

[thierry4wd]

From memory, the T9 + this launches at 575mhz and 890mv, 890mv is HUGE !!!

from my experience, it works very well at 575mhz (original speed) and 800mv or 790mv, thanks to that it saves about 300w ...

for your speed of 300mhz, you will have to set it to 790mv, or try 780 or 770mv, but it may not launch, or crash after a few minutes ...

It is necessary to understand, for comparison, the frequency is the speed which one asks of it, and the voltage and the energy which one gives it, if it does not have enough energy it will fail, but if it has too much , it will simply consume too much current!

ps: if you are looking to reduce noise, then set the fan fixed, the T9 + can go up to 105c chips absolutely without any problems, without any problem (i run 3 T9 + at 105-110c all time on arround 2 years !!! without any problems ...) ...

with pleasure;)

[AReal]

Would these changes work for the antminer S9se?

Code:

"api-listen" : true,
"api-network" : true,
"api-groups" : "A:stats:pools:devs:summary:version",
"api-allow" : "A:0/0,W:*",
"bitmain-fan-ctrl" : true,
"bitmain-fan-pwm" : "60",
"bitmain-use-vil" : true,
"bitmain-freq" : "O",
"bitmain-voltage" : "950"

Current Frequency is 458. My changes:

Code:

"bitmain-fan-ctrl" : true,
"bitmain-fan-pwm" : "60",
"bitmain-use-vil" : true,
"bitmain-freq" : "400",
"bitmain-voltage" : "850"

Did you ever get this to work ? If so, how did you get ssh enabled on the S9 SE ?
Searched but failed.   

[BitMaxz]

I want make RPM fan lower.. because 6320 RPM is very high..

The only parameter you need to change if you want to lower the fan speed is "bitmain-fan-pwm".
As you can see from the code above it is set to 60 you can change it to 50 or lower if you want to drop the fan RPM speed a bit.