Asic.to Custom Firmware - Optimize Performance & Efficiency S19/S21/T21

[tim-bc]

Hi,
is it correct, that stock voltage of fixed frequency firmware is 940?

9.4V is the max voltage limit programmed into the default firmware.

[1714140959]

1714140959

[1714140959]

1714140959

[Pirozhkov]

S9 13.5Th + P3 Power PSU 2100w -> Fix 650M frimware -> bmminer880

0.08 $/kWh
750m - 15.7th - 1670w profit - $0.38
700m - 14.9th - 1540w profit - $0.44
650m - 13.9th - 1430w profit - $0.44

Overclocking is not profitable?

[favebook]

I have a question for you @taserz.
I am using your mod for 3 of my Antminers.
First one is 13.5TH/s January batch, using 910v 825 freq and mining stable 17.6TH/s
Second one is 13.5TH/s March batch, using 920v 825 freq and mining stable 17.5TH/s
Third one is 14Th/s May batch, using 890v 825 freq and mining stable 17.6TH/s
All of them are using 1600W Bitmain's supply(I am only not sure for third one if it is maybe 1800W but it probably isn't, nevermind that).

My question is: why is PSU pulling 2kW from wall when it is rated only for 1600W, I mean, how is that even possible and will it hurt the PSU in any way? As I am running them for a week now and I had no problems.

[Andartis]

I have a question for you @taserz.
I am using your mod for 3 of my Antminers.
First one is 13.5TH/s January batch, using 910v 825 freq and mining stable 17.6TH/s
Second one is 13.5TH/s March batch, using 920v 825 freq and mining stable 17.5TH/s
Third one is 14Th/s May batch, using 890v 825 freq and mining stable 17.6TH/s
All of them are using 1600W Bitmain's supply(I am only not sure for third one if it is maybe 1800W but it probably isn't, nevermind that).

My question is: why is PSU pulling 2kW from wall when it is rated only for 1600W, I mean, how is that even possible and will it hurt the PSU in any way? As I am running them for a week now and I had no problems.

Of course it reduces the lifetime of the PSU, since it is not built for that load. On the other hand it has reserves. I am running them at higher loads for over a month now.

Check, if your cables are made for that loads! Dont burn your facility A rule of thumb is 80% of peak load can be constand load. So if your cables are rated 10A, i  europe you could theoretically draw 1800W constantly without problems. You can draw more, but keep in mind to check your cables some times.

[favebook]

Of course it reduces the lifetime of the PSU, since it is not built for that load. On the other hand it has reserves. I am running them at higher loads for over a month now.

Check, if your cables are made for that loads! Dont burn your facility A rule of thumb is 80% of peak load can be constand load. So if your cables are rated 10A, i  europe you could theoretically draw 1800W constantly without problems. You can draw more, but keep in mind to check your cables some times.

So you are telling me that I live on an edge... That is good to hear  
I've been checking cables every day at highest temperature peaks, they are "cold".
Cable input is rated for 16A 250V and output is 10A 220V(not sure for voltage, might be 250V).

Only once has it powered down due to overdraw(I guess), It reached ~2150W when I tried 940v 850 freq, and it even worked fine whole night while it was colder and when the ambient and outside temperature raised, it powered down.

[Andartis]

I run them at about 1750W now with bmminer880 at 750-775MHz. I had to tune one miner down to 725MHz because after some time it showed 0TH. The others run fine.
I might slowly ramp them up. But I want to stay with 880 for now and test how high I can go.

[taserz]

I run them at about 1750W now with bmminer880 at 750-775MHz. I had to tune one miner down to 725MHz because after some time it showed 0TH. The others run fine.
I might slowly ramp them up. But I want to stay with 880 for now and test how high I can go.

Are you running on s9 13.5 14 or s9i/s9j?

[Andartis]

Are you running on s9 13.5 14 or s9i/s9j?

I have only S9 with APW3++ PSU and bmminer880:
13.5TH miners running @15.4-15.8 TH @ 1620-1690W with 750MHz
13.0TH miners running @15.6 @ 1620W with 750MHz
14.0TH miners running @ 15.5-16.5 TH @ 1680-1720W with 725-775MHz

Is there any way to tune each board or even chip individually? I can not find any legit info about that.

[taserz]

I have only S9 with APW3++ PSU and bmminer880:
13.5TH miners running @15.4-15.8 TH @ 1620-1690W with 750MHz
13.0TH miners running @15.6 @ 1620W with 750MHz
14.0TH miners running @ 15.5-16.5 TH @ 1680-1720W with 725-775MHz

Is there any way to tune each board or even chip individually? I can not find any legit info about that.

You can it's a bitch and a half to code it but the gains are so small it isn't really worth it. Board tuning would be easier to do but if you got apw3++ only I wouldn't bother since you will have some boards that can take more power and clock higher and not enough juice out of that apw

[tomthegod]

My S9i running on 800Mhz with bmminer880, autotune stock firmware.
One of the board is much slower than the others.

What can I do?

http://i65.tinypic.com/t4tu9f.png

[taserz]

My S9i running on 800Mhz with bmminer880, autotune stock firmware.
One of the board is much slower than the others.

What can I do?

http://i65.tinypic.com/t4tu9f.png

I would try bmminer 890 or 900 since it is probably a power issue at that frequency.

[tomthegod]

I would try bmminer 890 or 900 since it is probably a power issue at that frequency.

Great idea, thanks!
With the bmminer 900 at 800Mhz the GH/S(ideal) and  GH/S(RT) is very close, boards speed almost equal and the has rate is 17.15 TH/s.
The power draw from the wall is 1900W, and this is the max of an APW3++ power supply, I confirm.

At 825Mhz the PSU overloaded and switch off.
So I need a second PSU.

[taserz]

Great idea, thanks!
With the bmminer 900 at 800Mhz the GH/S(ideal) and  GH/S(RT) is very close, boards speed almost equal and the has rate is 17.15 TH/s.
The power draw from the wall is 1900W, and this is the max of an APW3++ power supply, I confirm.

At 825Mhz the PSU overloaded and switch off.
So I need a second PSU.

Use 1 psu. The difference you gain is so small verse the power you draw beyond 800mhz.

[Andartis]

You can it's a bitch and a half to code it but the gains are so small it isn't really worth it. Board tuning would be easier to do but if you got apw3++ only I wouldn't bother since you will have some boards that can take more power and clock higher and not enough juice out of that apw

I see. Do you know a firmware without dev fee that supports this?
I am curious because I think that maybe we could max out the PSU and chips better by tuning good chips and leaving bad chips on lower frequencies.

[tomthegod]

Use 1 psu. The difference you gain is so small verse the power you draw beyond 800mhz.

I don't have to pay for electricity, so it not problem.

What is the maximum frequency you reach with S9i 14TH/s bmminer900?

[dutchlincoln]

@Taserz: Can you explain to me where the message is for that it can last up to 3 hours before actually mining?

Strange thing i notice today:
I have bought a bunch of used S9's for a good price, and some are as good as new, but first models. (older hashboards also; 4.0)
Now, i have 3 of my own miners running on the 880 FW and 793Mhz, stock psu, making 16-16.5Th each. So, it was quite a safe bet to do the same with these other miners; flash the 880, throw 793 at them, and go. After not even 5 minutes, they quit on me; psu overloaded. (never had this with my own...).
Also, the first i flashed, gave me one board with 5.5TH, one with 4,19, and another with 4.3. Seems to me that 2 boards cant handle it.
Now i wondered: is this the 3 hour break-in period, or should i start swapping boards amongst miners in order to have the best selected and oc'd?

Can you give me your thoughts about this?

Thanks!

[btc2017btc2017]

Hi, does this send a fee to the dev or is it dev fee free? Does the dev take donations?

I have the 13.5 TH/s S9 with auto frequency. I've set the frequency to 800 MHz and using the 8.8v file, most of the time I see 16.6 TH/s, but sometimes I see a random value, is this nothing to worry about?



A few F5 refreshes clears the problem


I have another PSU on an E3 (860W), can I take the remaining 3 PCIe cable and connect it to one of the S9s hashboards and possibly use a total of 2340 watts on the S9 assuming the PCIe cables can handle 266W (22A).

What would be the max TH/s I'll be able to get?

I do have some 1800W PSUs onsite so I could try that on the S9 at the weekend.

[Mousem40]

S9 13.5Th + P3 Power PSU 2100w -> Fix 650M frimware -> bmminer880

0.08 $/kWh
750m - 15.7th - 1670w profit - $0.38
700m - 14.9th - 1540w profit - $0.44
650m - 13.9th - 1430w profit - $0.44

Overclocking is not profitable?

This is a good question. Has anyone else looked into this, and are you wasting your time OCing these units?

[dutchlincoln]

This is a good question. Has anyone else looked into this, and are you wasting your time OCing these units?

intriguing...

Curious also, and as i had just laying around some miners and a watt meter, i have performed a little test:

500Mhz     10.8TH    4.9Amps   1120W  w/th:103
550Mhz     11.8TH    5.35Amps  1220W  w/th:103
600Mhz      12.8Th    5,8Amps   1330W   w/th:103
650Mhz      13.7Th    6,25Amps   1445W  w/th:105
700Mhz      14.4Th    6,8Amps    1570W   w/th:109
793Mhz      15Th        7,7Amps   1750W   w/th:116

overclocking is NOT profitable... (on this miner...)

i also have one running 793Mhz squirting 16.2TH. Assume numbers are equal, it would do 108W/TH

best: add miners...

[Shad0wSmurf]

intriguing...

Curious also, and as i had just laying around some miners and a watt meter, i have performed a little test:

500Mhz     10.8TH    4.9Amps   1120W  w/th:103
550Mhz     11.8TH    5.35Amps  1220W  w/th:103
600Mhz      12.8Th    5,8Amps   1330W   w/th:103
650Mhz      13.7Th    6,25Amps   1445W  w/th:105
700Mhz      14.4Th    6,8Amps    1570W   w/th:109
793Mhz      15Th        7,7Amps   1750W   w/th:116

overclocking is NOT profitable... (on this miner...)

i also have one running 793Mhz squirting 16.2TH. Assume numbers are equal, it would do 108W/TH

best: add miners...

Using which bmminer from this thread.