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March 06, 2016, 09:00:28 AM |
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As of right now, a working Titan has the best efficiency (I am not counting the Sfards SF100 unit, as those are very rare and apparently Sfards has abandoned trying to sell the things any more) - but Titans have a long history of having one or more of the die on their chips die, they are almost as "overpower the PCI connector" in their board-level design as their Neptune design (which has been documented to START A FIRE on at least one occasion and has been talked about having done so on other occasions due to how overloaded it's PCI connector and corresponding power traces on the PCB are), and just generally was not a good RELIABLE design.
Next is a tossup between an A2-based unit and an Alcheminer (efficiency on both is pretty much equal, close enough that individual unit variation matters in ranking them) - the A2s variants are a lot more common. A2s have a long reliable history, Alcheminers have a shorter history but seem to be good on reliability as well.
Innosilicon announced tapeout on their next-gen A4 Scrypt miner chip several months ago, based on their posts miners based on THAT chip could literally show up any day (along with their A3 SHA256 next-gen chip). The Alcheminer folks have announced they're working on a next-gen Scrypt chip as well, but seem to have less financing available and aren't as far along with it.
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