calculate 1.3 coins per day. "What a 400gh Fury makes today"
then drop that 30% every 10 days.
I don't see any ROI.
To be fair its an average of about 33% every 10.4 days. (difficulty average increase over the last couple weeks).
But as far as bitfury you should do 16x33.125 GH/s = 530 GH/s.
or 33.125 Gh/s per H-card.
Here you go, using 530 GH/s and 30%, or
BTC1.79/day theoretical earnings:
1.79 Tuesday, October 01, 2013
1.253 Friday, October 11, 2013 17.9
0.8771 Monday, October 21, 2013 12.53
0.61397 Thursday, October 31, 2013 8.771
0.429779 Sunday, November 10, 2013 6.1397
0.3008453 Wednesday, November 20, 2013 4.29779
0.21059171 Saturday, November 30, 2013 3.008453
0.147414197 Tuesday, December 10, 2013 2.1059171
0.103189938 Friday, December 20, 2013 1.47414197
0.072232957 Monday, December 30, 2013 1.031899379
0.05056307 Thursday, January 09, 2014 0.722329565
0.035394149 Sunday, January 19, 2014 0.505630696
0.024775904 Wednesday, January 29, 2014 0.353941487
0.017343133 Saturday, February 08, 2014 0.247759041
0.012140193 Tuesday, February 18, 2014 0.173431329
0.008498135 Friday, February 28, 2014 0.12140193
0.005948695 Monday, March 10, 2014 0.084981351
0.004164086 Thursday, March 20, 2014 0.059486946
0.00291486 Sunday, March 30, 2014 0.041640862
0.002040402 Wednesday, April 09, 2014 0.029148603
0.001428282 Saturday, April 19, 2014 0.020404022
0.000999797 Tuesday, April 29, 2014 0.014282816
0.000699858 Friday, May 09, 2014 0.009997971
0.000489901 Monday, May 19, 2014 0.00699858
0.00034293 Thursday, May 29, 2014 0.004899006
0.000240051 Sunday, June 08, 2014 0.003429304
0.000168036 Wednesday, June 18, 2014 0.002400513
0.000117625 Saturday, June 28, 2014 0.001680359
8.23376E-05 Tuesday, July 08, 2014 0.001176251
October 1st
BTC59.66392208
October 21st
BTC29.23392208
October 31st
BTC20.46292208
BTW, the full kit would have to make
BTC 5.5/day today (~ 1.6TH/s) for it to EVER mine the
BTC63 coins (with Oct 31st delivery) it cost to buy it.
ASICMiner all over.