Quote from: Shannon on July 20, 2012, 04:03 amtime for some back of the napkin calculations, first, let's assume your power costs 12 cents/KWh6850 costs around $135, plus $200 for the computer that surrounds it, plus it'll cost you 16MJ of energy per day or 53 cents. it would give you 0.12 btc, at $8/btc, you'd make 43 cents per day. even after 1000 days of mining, you wouldn't profit -- http://www.wolframalpha.com/input/?i=-335%2B.043x+from+0+to+1000x6500r3 costs $560 plus it'll cost you 1.5MJ of energy per day or 5 cents. it would give you 0.22 btc per day, at $8/btc, you'd make $1.71/day. you'd start profiting after 11 months and be up $1,150 after 1000 days -- http://www.wolframalpha.com/input/?i=-560%2B1.71x+from+0+to+1000Cool, except that in 1,000 days the rate at which BTC are mined will drop by half. So current calculations would have to be adjusted to factor that in.