Real world efficiency report:
Batch 2 Avalon, Delivered ~22 Jun 2013
Stock Enermax "Chiyan Gold Magic 750W" (Iffy translation)
http://www.enermax.cn/Products_Pages.asp?ID=198&SortID=1- All Japanese 105C Capacitors
- 62A +12V (Single Rail)
- 87Plus Ready - Efficiency "Up to 93%"
Unless I'm mistaken, this is the same platform as the Corsair TX750M but with derated +3.3V and +5V (20A vs. 30A)
I've been running ckolivas-releases firmware, mainly at a clock of 325MHz but moving up to ~350 recently; my AC supply is ~119volts at the wall under load.
Anyway, net/net for that time period is:
227KWh for 29.43BTC, or ~28MJ/BTC. My electric cost for this will be $13.3, so this is profitable for BTC > $0.45, or at $70/BTC it is profitable to a difficulty of ~3Billion.
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edit: I paid ~ 76BTC for this Avalon, so it is almost halfway to recovering its cost.