Quote from: HashZilla on September 17, 2017, 08:01:44 PM

Quote from: philipma1957 on September 16, 2017, 10:55:24 PM

Quote from: Logan4el on September 16, 2017, 07:09:55 PM

Quote from: Didley1JT on September 16, 2017, 06:56:43 PM

Quote from: Logan4el on September 16, 2017, 02:39:37 PM

Mining difficulty will go up by 22%. What is you plan to do with 741? Undecided

741 seems outdated for me, even thought I am sitting on free socket.

You want to share where you get your magic number from?

And anyone sitting on ACTUAL free electricity and not mining is an absolute idiot. If you have free energy, then what is your reason for not using a 741? You're not making back compete profit fast enough...?

Bitcoin difficulty chart https://bitcoinwisdom.com/bitcoin/difficulty

so what's 20 %

it is nothing.

suppose it follows with

https://bitcoinwisdom.com/bitcoin/difficulty

Date   Difficulty   Change   Hash Rate
Sep 06 2017   922,724,699,726   3.89%   6,605,120,681 GH/s
Aug 24 2017   888,171,856,257   -3.80%   6,357,781,793 GH/s

or this

Nov 05 2016   254,620,187,304   0.40%   1,822,642,296 GH/s
Oct 22 2016   253,618,246,641   -1.90%   1,815,470,125 GH/s
Oct 08 2016   258,522,748,405   7.17%   1,850,577,916 GH/s
Sep 25 2016   241,227,200,230   6.82%   1,726,771,560 GH/s
Sep 12 2016   225,832,872,179   2.30%   1,616,574,667 GH/s
Aug 29 2016   220,755,908,330   1.56%   1,580,232,344 GH/s
Aug 15 2016   217,375,482,757   7.67%   1,556,034,316 GH/s
Aug 02 2016   201,893,210,853   -5.43%   1,445,207,896 GH/s
Jul 18 2016   213,492,501,108   0.04%   1,528,238,850 GH/s
Jul 04 2016   213,398,925,331   1.88%   1,527,569,009 GH/s
Jun 21 2016   209,453,158,595   6.83%   1,499,324,110 GH/s
Jun 08 2016   196,061,423,940   -1.63%   1,403,462,340 GH/s
May 24 2016   199,312,067,531   2.60%   1,426,731,353 GH/s

which actually is from

May 12 to Nov 17 which is 6 months just under 2% a jump

lets make the diff 1844 vs 922 and coins at 4000 see what we get.

https://bitcoinwisdom.com/bitcoin/calculator

Date______________Difficulty___Revenue_____   Profit

9-17 9-17 (1 day)...1844 G.......1.38..............1.367

with a pool charging 1% and diff 1844g 2x current diff the gear still makes 1.36 a day

I used

1844g for diff
10 cents a kwatt

I think you took too small a sample for your increment, not least because it contained the lowest quarterly increment in the last two years(as far back as that web site shows). The average increment from the entire 2-year data set, is 5.46% per increment.

Using that average increment produces the following results...note that the calculator only goes about 280 days forward.

5.46% increment @ $3700 BTC, Avalon 741 ($875 inc. PS, 1150 watts) goes negative profit in 248 days, Net$(-434)
5.46% increment @ $4000 BTC, Avalon 741 ($875 inc. PS, 1150 watts) goes negative profit in 262 days, Net$(-341)
5.46% increment @ $5100 BTC, Avalon 741 ($875 inc. PS, 1150 watts) achieves ROI in 258 days, 280days Net$14
5.46% increment @ $6000 BTC, Avalon 741 ($875 inc. PS, 1150 watts) achieves ROI in 147 days, 280days Net$308

If the difficulty trend continues (which is possible due to overshoot in mining equipment purchases) then the BTC price will need to rise above $5000 for the 741 to be a winner.

More likely, the difficulty will stagnate as mining rewards dwindle, and rewards hover at a point that favors low or no-cost electricity.

But quick ROI is no longer to be expected.

Thats right don't buy any gear based on a projected 5.5% diff jump you say will happen for the next 2 years.

I have that data for the last 7 years.. and we have had 18 month time span of next to 1.5% a jump

which is my point no one knows what diff will be over the next 6 months.

posting that any gear is obsolete or next to obsolete when it is not close to obsolete is wrong