Okay, in the post he says the most efficient test was 575-590watts, 804-817GH/s so the best would be (575w/817GH/s) or .703w/GH/s. The 1008GH/s test doesn't show a wattage. His highest frequency test 1123GH/s drew 943watts or .839 w/GH/s.
Wish he had provided the watts at stock settings but yes, these are good numbers, better than mine.
I thought I did, but stock was 1008 / 802Watts @ .74v
The best was 805-821GH/s @ 575-600 watts between all 3 C1's I have. After that they start sucking Juice like my 3year old
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I stopped using them as I'm concentrating on much more efficient miners for now (SP20's / S5's), but in a few days my $0.0779 / KWh kicks in and I'll put them to work in my office as they are quiet as heck, so the quiet factor I agree is much better at the trade off , of low hash rate/ high power usage.
On the other hand, now that I think of it, it's like an Avalon 4.1. I think those go down to 800GH/s @ about 550 watts and are very quiet. Almost the same I guess. I'll have to try one.
Okay. So, $0.0779 will be your power cost. Down here where it will get hot this summer my bill shows power to cost $0.075 but when I add in taxes but not line charges I see $0.0805 but it's not all that clear with their adjustments.
I worry about the heat damaging the ASICs.
To be honest, using the Kill-A-Watt, I don't see a big deal in cost savings when tuning for lower energy but I haven't tried the big jumps down.
Interestingly, with your numbers for C1 run at almost stock frequency and voltage, your 1008 / 802Watts @ .74v, compares well with these I took: after 1 hour at 250M/0760 I had 1008.57 / 818 watts for .811w/GH/s but the same unit at 2 hours showed 1002.88 / 819 watts for .816w/GH/s. Ambient was 80°. So reading of 802 watts is 98% of my 818watts. That's only a 2% difference in supply efficiency.
I'm using four 360 watt LED power supplies each modified with a heatsink added to the bridge rectifier, the one turn pot changed out for a Bourns 3299w-501 500 ohm trim pot that has, what, 20 turns from 0-500 ohms for more precise adjustment of the output voltage, and each supply has added a 6 amp 120vac line filter (reducing noise so it doesn't disturb my TV watching/recording), but, each supply costs under $25 with free shipping. Each supply drives one blade. I don't put them in parallel anymore as it's easy to burn one up in parallel. Then again I had to build my PCIE harnesses. Also I add 3½ digit LED voltage readouts to each as it's easier to tell if there's a problem.