KNC Jupiter 550gh 0ct 18th 2013 till now ....very very close to getting 50 btc out of the beastie!
Interesting so the BTC profability per $/Watt has moved as follows from FPGA to ASIC:
Hardware: 0,075 to 0,005 BTC/$
Electricity: 3,75 to 0.06 BTC/Watt
That's a factor x15 less for hardware price and >x60 less for electricity cost. O_o
Lets push that difficulty a little bit more!
Remember: if you heat your home in the winter (not overheat!!!) with mining; ROI does not matter!
Hell you can even run old ASICs at a loss, they will always be less expensive than your radiator!