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I'm getting 1960w draw at the wall running at 27.5TH/s.  That seems pretty high to me.  I thought these pulled like 1600 - 1700w.  Anyone else seeing this issue, or am I way off base.  Miner is running in a wide open area in my basement so its around 60 degrees right now in the cold NE winter!

can you put it on low?  i think i would do 900 watts and 18.2 th

i would be interested to see the numbers you get.

low power:
1050w and 17.5TH/s

Okay compared to mine  it runs poorly.

an extra 150 watts and .5th less

I kind of would touch 50 watts a th   while you  are doing  60 watts a th.

I have seen meters be 50 watts different at 1000.

so I could be 950 watts and 18th = 52.78 watts

you could be 1000 watts and 17.5 th  =  57.14 watts

Lastly I measured a 90 day old machine
You may be measuring a 400 day old machine

Of course  silicon lottery is a factor  but it does look like yours is ay least 5% worst then mine was when I measured it a year ago.

I can  check my hashrate for it  in 2 minutes

it is 27.32th over the last day on high.
I do not have ability to check power use unless I drive up to the site.

I liked this machine  it was a good home miner on low setting.

here is a screen shot of it running

https://i.imgur.com/owrR0vY.png (https://i.imgur.com/owrR0vY.png)

Yep... I think I lost the chip lottery.   I used the same meter for all of my l3+ which run pretty spot on to spec.  I'm a little disappointed as I am just getting back into btc mining after I have been ltc mining for years.  Oh well.  That the way it goes! Thanks for all the replies!

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So this is super weird.... After running in low speed mode for about 20 minutes, wattage dropped to 925w which is right where I'd expect it and the hash speed didn't change!

Further weirdness.. when I switched back to normal mode, it didn't speed up the fans, so I was hashing at 28th/s pulling 2000w and my chips got super hot, pretty quickly!  When a few got to 110c I shut it down (sleep mode).  The fans never budged above 2500 rpm.  What the heck?!?! Once it cooled down I pulled the plug and will investigate furthe later today when I have time.

Hmmm   weird but worst case mine it on low  as 925 watts and 17.5 th  is pretty good.    52.87 watts a th. and fairly  quiet.

So it think it was the "cold protection."  Looking at the hashing in full speed, several of my pcb readings were sub 25, I read in pother threads that volatge will be increased to warm them up, I wonder if in low power, the boards get warm enough and it drops voltage, thus dropping down to the 925w

that makes sense and you ended up very close to my 50 watts a th once boards got warm.

Do you know of anyway to control the fans?  On full speed, the fans ramp up to 5000 rpm and my pcb boards stay below that 25 threshold, I think that may be a reason why I end up over 2000w on full speed.

Based on your reply on my topic you seem to have fixed the fans issue:


Did you see any improvements in terms of efficiency?  I have never actually bothered measuring the fans power consumption, but i remember someone else saying that running the fans at higher RPM will make the miner consume less power due to the fact that the hotter the miner runs the more power it consumes, and if that is true then lowering the fan speeds will only make your miner suck more power, please confirm.

Ist me :D , so is true, but, on the S9K (and other, probably same at S15), if i run this with lower fan, the temp up to 95 - 100, and miner set voltage at LOWER, so 9.70V ... If i turn FULL SPEED fan, temp is very low, but miner, after arround 3 cycle of 30min, set voltage at FULL ! so 10.10V !!! is totaly stupide !

But, i understand now, is only for FIXED efficiency ! shitmain ... if you run at 0 or 40 degré ambiant temp, you give same power at wall (arround)

And for power conssum by fan, at 20% or 100% , with 4 fan, de diference is arround 150W (high depend by fan models).

There is a sweet spot, especially on the s15, not sure about other miners...

high fan = too cold and voltage jumps to warm chips, extra juice for fans and voltage = real bad (and dumb... what are they worried about at 25 C?)
low fan = too warm, chips run hotter but at lower voltage at least but do consume more juice, lower fans a little less juice = ok
medium fan = boards stay warm enough to drop voltage, but also dont waste juice on fans = best

Also I saw power at the wall jump 60-70 watts when the fans cycled from 3300 rpm to 5040 rpm.

Also, the html fan trick for s9 does set fan % for s15, but there stills seems to be some over ride built in as the fan every once and a while cycles higher.  Its better than just auto but still not full control... the chips and boards aren't even close to max temp when it cycles up.

when is that custom firmware gonna be ready :)

Yes, it was you, sorry I forgot  ;D, I understand and based on that one should really test every miner model individually to see which setting fit best in terms of higher RPMs to power consumption ratio.


on Vnish.net it says:


This involves S15,T15,S9k and S9E, although I am not sure if Vnish.net is the official website for Vnish (the developer).