sidehack
Legendary
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Activity: 3318
Merit: 1848
Curmudgeonly hardware guy
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August 12, 2015, 05:12:52 PM |
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I think MrTeal reported the 11V reliability floor, and I trust him to know what he's doing. What board version is that? I only have access to some partly-working V1.3 PCBs with six level-shifter diodes, but I've seen some others (not sure what PCB rev) with only five. I haven't checked what the difference is.
Also, I'm really surprised you got 0.25W/GH out of it with the extra fan and controller current.
I would also be surprised to see a BM1384 S7, but given the S4+ and S5+ they don't seem to mind doing things I think are kinda stupid and still turn a profit on it. I figured 3x17 to be a practical max for BM1384 on a S[odd] chassis but that doesn't give you much benefit over the 2x15 string currently in use - about 10% more hashrate at about 20% less power for 70% more chip cost - not like a new-gen chip would. If they're prepping for someone else to put out a new gen in the next month or so it makes sense to get a leg up by moving better gear, but Bitmain has already proven they have no interest in competing with themselves as long as their machines are the most efficient already. Unless someone else steps up with a gamechanger efficiency (rumors for LK's machine are December shipping), they'll continue to push approximately-status-quo miners like the S4+ and S5+ even though they could have been selling better equipment than that six months ago if they wanted to. I'd be surprised to see the S5 and S5+ as the only BM1384 miners released, since they're not even touching the low range of a really good chip like the S2 did for BM1380 and the S4 and S4+ did for BM1382.
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