Bitcoin Forum

I remember when I first got into bitcoins someone created a simple spread sheet with different rig build options. It would compare them by the initial cost, BTC/day, power consumption etc... It was useful in helping me pick out my first rig, from that idea I decided to do something similar for FPGAs to aid in figuring out which is the best one to buy.

edit: I completed the spreadsheet. It now includes your approximate ROI. I added one GPU mining rig for comparison.
Here is a basic screenshot. you can download and view the full spreadsheet (https://skydrive.live.com/redir.aspx?cid=657cdded20d2ddc0&resid=657CDDED20D2DDC0!129&parid=root) from my skydrive account.
https://i.imgur.com/97oqd.png (https://skydrive.live.com/redir.aspx?cid=657cdded20d2ddc0&resid=657CDDED20D2DDC0!129&parid=root)

Nice work.

My suggestion would be to add the same data, but for batch price, like with Ztex. I remember that it goes from 420 to 250$ if you buy a big batch, and the new price change considerably the data.

Can you put it on Google docs and share it? That's less dangerous (for us) than sharing an excel file.

It looks good so far. I'm glad someone is finally doing this.

If nothing else, you should add a readily available GPU like the 7970 just for reference comparison purposes.

I already ran these numbers a few days back: https://bitcointalk.org/index.php?topic=77469.msg887606#msg887606

I added a used 4x 5870s rig. If you give me the information I can updated it. Now you can do it yourself as well I uploaded the spreadsheet

Didnt know about that. I added more information and I think this is a little nice to look at as well then all plain text.

Nitpick:  ROI stands for "return on investment" and is the percent difference between the return and cost basis of an investment.  You mean "break-even".

May've made more sense to use the most recent batch of Icarus boards to be produced/sold rather than older versions.

~18.5-19W consumption, $480 shipped with adapter, 380MH/s, not sure why you'd include cost of a dev kit. /fanboi

done. changed it to break even date.

Not sure why I included the dev kit, removed now. I was debating about using that price of $480. I ended up using the original price because the last sale was a large batch comprised of several people. I updated it now to use the price from the most recent batch.

I changed the % income a day to % income a month which is a value people are more use to seeing.

Is this all assuming a stagnant difficulty?  ???




is that "not" factored in, or "noted"


EDIT: If you want a more accurate estimate, you should assume a constant increase and do a step integral like I did here (https://bitcointalk.org/index.php?topic=81407.0), it makes a BIG difference when you look at long term returns.   ;)

yup stagnant difficultly right now. I went with stagnant because the difficultly is not always increasing. difficultly still hasn't pasted 2MIL ever so it might be better to set the difficultly to a steady 2MIL which would low ball your income but maybe give you a nicer estimate. Another reason price of BTC is not set by the difficultly but some people suggest there is a correlation and that the price lags but follows the difficultly which would off set the need to have a changing difficulty(hasnt really been true lately).

I suppose I could make it configurable. Ill add that and leave it at 0% but if someone wants they could change that number to anything they wish.

thanks fixed the typo "not"

What is the electrical cost to 50 row?  Also how'd you get to break even if you're losing money after break even day?

Price/difficulty have a modicum of influence on each other.

If price is high, people are more likely to mine. If price is low, people are less likely to mine.

If difficulty is high, people are less likely to mine. If price is low, people are more likely to mine.

Now, obviously all of us mining fall into some mix between the two, but when you start throwing in supply and demand is where it gets more complicated. Miners who use coin for mining-related expenses and etc may buy coin when it is beneficial to them (when price is very low). In fact, if the markets ever crash again, we may see some GLBSE mining companies go private because of this.