Hi everyone,
I have recently started Bitcoin mining as I bought an HD6970 for gaming and thought I could earn a few bucks back to help pay for the card. I am running GUIMiner on Windows 7 64 bit and get around 400MH/S. I have done plenty of research, and was thinking about maybe getting a dedicated rig with multiple PCI-E slots to try and earn some money. The sites I have looked at that estimate profit all seem to have one flaw - they don't take into account the increasing difficulty of mining. To this end, I decided to make a speadsheet that takes this into account. I was shocked at the results, since these seemed so much different to the results I had from the other sites. For example, my current rig looks like this :
http://i228.photobucket.com/albums/ee192/touche36/BitCoin/6970a.pnghttp://i228.photobucket.com/albums/ee192/touche36/BitCoin/6970b.pnga rig with 2*HD6990's looks like this :
http://i228.photobucket.com/albums/ee192/touche36/BitCoin/2x6990a.pnghttp://i228.photobucket.com/albums/ee192/touche36/BitCoin/2x6990b.pngand 4*HD5770's looks like this :
http://i228.photobucket.com/albums/ee192/touche36/BitCoin/4x5770a.pnghttp://i228.photobucket.com/albums/ee192/touche36/BitCoin/4x5770b.pngHave I done something wrong ? Have I missed some fundamental point ? I don't see the point in buying hardware, when you can only get such a small return on your investment (other than the fun and knowledge gained) :-)
If you want to download the spreadsheet (Excel) and check for mistakes, or put your own figures in, you can find it here :
http://www.filefactory.com/file/cc3d4b5/n/Bitcoin_Caclulator.xls or here :
http://www.megaupload.com/?d=L8CGMTC2BTW I live in the UK, hence the electricity prices
