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1  Bitcoin / Mining support / S17+ (70TH) Hashchain missing (but not always) on: September 10, 2020, 11:31:07 AM
I have a brand new S17+ (70TH). From time to time Hashchain 0 is missing.

I found the following entry within my logs:

2020-09-10 11:15:27 driver-btm-api.c:1155:check_asic_number: Chain 0 only find 0 asic, will power off hash board 0

I have heard that this may be a common problem on the S17 series. What I don't understand though, is that this problem seems to come and go randomly.

When I turn off the miner and turn it on the next day it can occur. It can remain like this for a couple of days. Then without any clear indication why, all three Hashchains are found and working again. (Without any problems).

The problem either appears or disappears only when I turn off the miner and turn it on the next day. Once it's running (with 2 or 3 boards), it stays like that.

I turn the miner off every night (going to sleep mode first, too cool down). The past 6 days the miner was started every morning without any problems. Today the problem occured again. A number of reboots, power disconnects did not solve the problem (like the last times).

All temperatures are within a normal operating range.

Things I have tried:

The thing is I don't really want to send it in for repair, as it seems all parts of the hardware (can) function properly. (and it will take forever).

What may be the cause of this, and is there a potential fix?
2  Bitcoin / Mining speculation / How to calculate bitcoin earnings in FPPS on: July 29, 2020, 07:59:06 PM
I am currently working on a formula to calculate my bitcoin earnings for a 24h timeframe on pool.

The formula I have come up with so far is the following:

bitcoinPerDay = ((minerHashrate * blockReward * numberOfSecondsPerDay) / (difficulty * 2^32)) * poolFeeMultiplier

The results I am getting are pretty good. They are very close to the results that the mining calculator at is giving me.

At the moment my formula only works for PPS payout. Using the calculator I can see that in FPPS earnings are about 10-15% higher. I would like to know how I can include the FPPS-Reward/Transaction-Fee into this calculation.

Any hints are appreciated!
3  Bitcoin / Pools / FPPS or PPS Pool with instant same day payout (Recommendation) on: April 24, 2020, 03:38:11 PM
I am looking for a bitcoin pool with FPPS or PPS reward system that will allow me to receive mined Bitcoins as soon as the minimum payout amount is reached. I want to exchange my mined coins to FIAT as quickly as possible. Low pool fees are obviously very a big plus as well.

I have been mining on for a while, but there I need to wait 48hours to receive my mined coins for "security reasons".  Huh

Any suggestions are appreciated
4  Bitcoin / Mining software (miners) / change Voltage & Frequency using cgminer api on: April 17, 2020, 09:22:16 AM
Hello dear fellow Miners,

I am trying to understand how I can change global voltage and frequency on my Antminer S9s using the cgminer API. I have been able to monitor all kinds of things, change pools etc. but I don't quite understand the documentation clearly.

Could somebody provide me an example?

I believe the command below (from the documentation at: might be what I need?

ascset|N,opt[,val] (*)
               none           There is no reply section just the STATUS section
                              stating the results of setting ASC N with
                              This is only available if ASC mining is enabled

                              If the ASC does not support any set options, it
                              will always return a WARN stating ascset isn't

                              If opt=help it will return an INFO status with a
                              help message about the options available

                              The current options are:
                               AVA+BTB opt=freq val=256 to 1024 - chip frequency
                               BTB opt=millivolts val=1000 to 1400 - corevoltage
                               MBA opt=reset val=0 to chipcount - reset a chip
                               BMA opt=volt val=0-9 opt=clock val=0-15
                               MBA opt=freq val=0-chip:100-1400 - set chip freq
                               MBA opt=ledcount val=0-100 - chip count for led
                               MBA opt=ledlimit val=0-200 - led off below GHs
                               MBA opt=spidelay val=0-9999 - SPI per I/O delay
                               MBA opt=spireset i|s0-9999 - SPI regular reset
                               MBA opt=spisleep val=0-9999 - SPI reset sleep ms
5  Alternate cryptocurrencies / Mining (Altcoins) / Hardware Suggestions for Mining with a LOT of free sustainable Energy on: December 05, 2019, 11:07:06 AM
I have access to a lot of cheap/free electricity from sustainable energy sources. Over the course of an entire year the costs for 1 kWh average at around 6 cents.
On many hours, days or weeks of the year energy production is higher than what can be sold, making the costs for 1 kWh effectively 0 cents.
On other days the costs are between 0-5 cents, but the prices can go as far up as 15-20 cents for 1 kWh.  

Given the fluctuation of the kWh prices I won't be able to have my hardware running 24/7 to really make a profit. Though considering that often electricity is completely free I am looking for hardware suggestions. I would prefer mining Ethererum or Bitcoin, but I am open for other suggestions as well.

I suppose what I need is hardware that has the highest possible amount of TH/s at the lowest hardware price, with a complete disregard to its power consumption.

Any informative replies are most welcome, thanks! Smiley
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