Quote from: CHAOSiTEC on August 21, 2014, 03:50:45 PM

Quote from: OneCardShy on August 21, 2014, 03:30:37 PM

Moving away from the negative hopefully.... I have an ROI question that I cannot figure out how to calculate. As I have stated, I am able to set up miners, but not really smart about them.

I own 4.8Ths that is already ROI, including electrical costs. I have pre-ordered two S3+ to (hopefully) ship around Sept 20. They were paid for with 1.16BTC generated by my mini-farm after it reached ROI (free BTC). I calculate them as 450GHs each or 900GHs for the equation.

That will bring my mini-farm up to 5.7THs. It has been established and is almost not arguable that a single S3+ cannot ROI by itself.

My question: As an added component to an existing farm, is it possible for the additional benefit of two S3+'s to the already income-producing condition to 'ever' benefit by 1.16BTC? I don't understand how to calculate existing hashing power into the ROI equation.

Thank you for any assistance. I also would like to apologize to JPChrist. I agree that personal attacks do not benefit the community and I look forward to learning from his helpful posts.

-OCS

since your 4.8 TH farm has given back the investment, what they do now, is give you "free coins" (if they generate more, than what your electricity costs)

so, for everything you add to your farm, the only worries you have, is to deduct power costs and and then you can use the rest to make your ROI on your S3s go away faster, but remember to "save up in the bank" to be able to buy newer equipment, when your old equipment cant pay for the electricity alone anymore..

I started out with 3x Antminer S1s they have ROI and given me enough coins to buy the 2xS3s, now i have all 5 units hashing away, and i almost have enough to buy 3x upgrades for the old S1s...

FINALLY!! Some sanity to this ROI stuff. I started out with USB Block Erupters, then to blades, the to S1s and now S3s. Each upgrade was paid for with BTC generated by the previous hardware (both from mining and reselling) The only "investment" I made was in the original bunch of Block Erupters and supporting equipment. That has long ago been paid back (I actually cashed out enough BTC to repay my initial cash outlay) Now my small farm of 10 S3s pay for their monthly electricity usage in 1 week of mining. Another thought on ROI...No company does ROI on every single piece of equipment they buy. It the money generated by ALL the equipment they are using to create their product against cost of ALL of the equipment minus salvage value or whatever is left on the depreciation.