I was one of the last to order from B8 and it shipped last night. B9 is set to ship the 18th and I have no doubt it will be on time. BITMAIN WINS!
Actually, AM Tubes are cheaper per Gh/s than S3s and are always available for immediate delivery. The S3s are more efficient though. I posted the following earlier in the Spondoolies thread to show how crap the SP20s are:
Let's assume a static network hash rate of 300 Ph/s, power costs of 0.1 USD/kWh and an exchange price of 500 USD/BTC.
SP20 costs 2.64 USD/day,
SP35 costs 8.4 USD/day,
S3+ B9 costs 0.86 USD/day, and
AM Tube costs 2.16 USD/day.
SP20 at 1700 Gh/s would mine 0.0204 BTC/day or 10.2 USD/day,
SP35 at 6000 Gh/s would mine 0.072 BTC/day or 36 USD/day,
S3+ B9 at 453 Gh/s would mine 0.005436 BTC/day or 2.72 USD/day, and
AM Tube at 800 Gh/s would mine 0.0096 BTC/day or 4.8 USD/day.
SP20 would make 7.56 USD/day profit,
SP35 would make 27.6 USD/day profit,
S3+ B9 would make 1.858 USD/day profit, and
AM Tube would make 2.64 USD/day profit.
SP20 costs 1,500 USD inc. PSU + shipping, it would take 199 days to break even,
SP35 costs 4,035 USD inc. PSU + shipping, it would take 147 days to break even,
S3+ B9 costs 320 USD inc. PSU + shipping, it would take 173 days to break even, and
AM Tube costs 500 USD inc. PSU + shipping, it would take 190 days to break even.
With the SP35s not being shipped till November and the SP20s being shit value, it basically comes down to how long you have to wait for the S3s. If the wait is too long, you'd be better off getting an AM Tube.
Nice work
I have done some of the same calculations and have come to similar numbers.
After much thought I ordered the s1 upgrade kits.
It keeps getting harder to ROI. So hardware cost and power become much more important.
again---- nice work.