Re: ANN: BITMAIN has Tested Its 28nm Bitcoin Mining Chip BM1382

ROI on these?
at .75 Btc at avg 20% increase and 10 cent KWh

do these ever make the btc back?

.015 BTC per day should ROI in under a 100 days. I already had the PSU's from S1's so no additional costs there. 0.75 BTC is the hairy edge IMO.

NOW where are the COUPONS!! Wink

Id check that math again...They will NOT roi if difficulty increases @ 20%.

Well Christ I do not believe Diff will continue to rise @ 20%, as of this increase network has fallen on it's face and is running under 6 blocks per hour and has been for almost a day. That 25% increase KILLED the last of the FPGA/GPU miners. Anyone running a BFL single is going to be shutting them down SOON. My 2 60's earn approx $2.04 USD per day, but cost me $1.15 USD so they are on eBay as we chat.

I believe these will make money for anyone that:

1) pays no import duty
2) has the psu's already
3) pays under 16 cents a kwatt
4) can do the summertime cooling without ac

I meet all of those criteria but I think I will still wait.

I grabbed the minimum of 2. I am facing a good problem as I purchased 2.25 btc to buy these when coins were 560 now coins at 620.

I may just sell the .75 btc and grab a bit of profit.

as for psu's it is interesting since you are buying 2 not one.

you want a psu that will do 850 watts. I would not use the dell server psu's they suck power. and are very loud