When to underclock my s-1. June 1st , July 1st??

philipma1957

legendary

Activity: 4256

Merit: 8551

'The right to privacy matters'

Quote from: klondike_bar on May 11, 2014, 12:37:04 PM

depends on at least 3 factors:

1) electricity cost: if you pay >$0.20/kWh you will be underclocking a few weeks sooner than those paying <$0.15/kWh
2) temerature and electrical capacity: if your place is getting too hot it may make sense to undervolt a little bit to reduce the power used and thus temperatures
3) your short-term and long-term views of USD/BTC. If you expect us to sit around $400-600/BTC for the next 6+ months then you will underclock sooner (at a loss of hashrate) than those who expect it to go to $1000 or higher and thus justify the higher power costs to produce the maximum BTC possible

1) is true

2) is true-------------I can do 2000 summer watts and manage the cooling. I can do 4000 winter watts.

3) really complex difficult to agree or disagree. a lot of factors to take into account .

My numbers used will vary from miner to miner but the side by side comparison technique of bitcoin wisdoms calculator will help you ballpark.

klondike_bar

legendary

Activity: 2128

Merit: 1005

ASIC Wannabe

depends on at least 3 factors:

1) electricity cost: if you pay >$0.20/kWh you will be underclocking a few weeks sooner than those paying <$0.15/kWh
2) temerature and electrical capacity: if your place is getting too hot it may make sense to undervolt a little bit to reduce the power used and thus temperatures
3) your short-term and long-term views of USD/BTC. If you expect us to sit around $400-600/BTC for the next 6+ months then you will underclock sooner (at a loss of hashrate) than those who expect it to go to $1000 or higher and thus justify the higher power costs to produce the maximum BTC possible

rograz

hero member

Activity: 575

Merit: 500

To know when to under-volt yo will have to calculate when (the reduced power draw/reduction in hash rate) in terms of efficiency becomes unprofitable. When the initial performance/watt of the miner becomes unprofitable doesn't matter, example.

Under-volted ant

140GH/170ish watts

Stock ant 200GH/380W

So the number we are looking for is when (380W-170W) / (200GH -140GH) = When 3,5W per GH becomes unprofitable for you is when you should under-volt.

philipma1957

legendary

Activity: 4256

Merit: 8551

'The right to privacy matters'

A few people have asked me to show them how to know when to underclock/undervolt

an s-1 to max fiat profit.

the current thread on how to do it.

https://bitcointalksearch.org/topic/guide-undervolt-antminer-s1-119wgh-at-the-wall-526060

This does not factor your heating and cooling only fiat profit

I used this calculator

https://bitcoinwisdom.com/bitcoin/calculator

Here is a side by side screen shot of when to determine the time to under clock

If you look at the side by side .

you see I did 7 s-1's

one at overclock 1400gh and 2800 watts

the other at under-v /under-c 1050gh and 1400watts.

I used my summer power rates of 18 cents a k-watt I used 15% diff jumps and 432 usd a btc.

If you look down the side by side charts you can see the time to do the switch is right after June 20th

june 20th with under-v/under-c the after power fiat profit is 161.20
july 3rd with under-v/under-c the after power fiat profit is 129.90

june 20th with 393 over clock the after power fiat profit is 162.50
july 3rd with 393 over clock the after power fiat profit is 120.70

Of course power cost will vary, diff varies, btc price varies.

This is still the method to determine when to lower clock and voltage. You will need to plug in your numbers at each diff jump to be perfect but the side by method of calculator will show you the correct answer.

Topic: When to underclock my s-1. June 1st , July 1st?? (Read 695 times)