Firmware for underclocking Antminer S19?

[MrT2000]

Hei, just made a account here.

I'm tinkering with a Antminer S19JPro and want to use it as a space heater. Using Braiins OS+ now but it will not let me set a lower powertarget than 1700w for all 3 hashboards. Is there other firmware i could use?

To make it quiet enough to be used at home and not overheat i need less than what braiins os can do.

[BitMaxz]

You can try asic.to but I don't think you can target lower than that since all hashboard are running.

Why not remove 2 hashboards if you want to target lower power?
I'm sure you will get the target wattage that you want from Braiins OS.

[MrT2000]

I did try to remove 1 and 2 hashboards, but the problem is that each hashboard run at minimun 6-700w and they overheat with silent fans. If i could split the heat over all 3 board i could keep them cool and silent.

I have a S9 with braiins, and on the S9 i can underclock each board down to +-130w and i'm able to keep it cool at 400w total, spreading the heat over all 3 boards. Enough to help keep my bathroom warm.

If the firmware on the S19j Pro would work the same as on the S9 i should be able to underclock it down to under 1000w on all 3 boards given that the S19J Pro have a normal power usage at 3.2Kw compared to the S9 at 1.4Kw. In theory..
  

[philipma1957]

epic controllers are not free but you can do really low with them


https://altairtech.io/product/epic-umc/

[MrT2000]

epic controllers are not free but you can do really low with them


https://altairtech.io/product/epic-umc/

Wow looks promising. Do you know how low you can go?

[philipma1957]

epic controllers are not free but you can do really low with them


https://altairtech.io/product/epic-umc/

Wow looks promising. Do you know how low you can go?

okay the boards work with

all S19
and t21
and s21


When you under clock it allows you to disable any of the 3 boards

it also allows as low as 50mhz freq and 12 volts if you do manual.

you can also go way high like 600 freq and 15 volts
and that are the manual settings

more than that you can autotune from 60th to 300th   on the t21 I have.

the flexibility is huge much more like a gpu from the old days of mining.

You also may find you a board that allows really low settings and another board that allows high settings.


t21 thread

https://bitcointalk.org/index.php?topic=5491800.0