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August 11, 2015, 12:03:57 AM |
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Unless your power rate is under 5 cents/KWH, a S5 is real marginal for ROI once you factor in the cost of power supply before it becomes unprofitable. You'll probably pay off the S5 but you'll still owe some on the power supply, ASSUMING that difficulty average increase stays where it's been so far this year and Bitcoin price doesn't dump again.
If your power is cheaper than that, you probably will ROI an S5 and MIGHT ROI the PS too unless profit factors change for the worse.
The "halfing" is currently estimated as "end of July" right now, but every time we get a difficulty increase it's because the blocks got processed faster than "default" and that halfing moves forward a little bit - given current trends I'd guess halfing around mid-July.
Without the halfing, a S5 profitability would probably be getting a little marginal by that point, but chance of ROI eventually would be VERY GOOD with electric at 7cents/KWH or less.
IMO wait a month or two, the S7 appears to be in production but Bitmain wants to sell of their "farm"/Hashnest S5s and replace those with S7s before they start selling to the public - and Lktec has already pre-announced a 5TH 1KW unit that appears likely to be based on the Innosilicon A3 (for which tape-out has been quietly announced, likely in production fairly soon).
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