New to this thread and TL:DR on the rest of it. GITS referred me here and told me to bring some data since I just picked up an S5 and am doing a project for the school with probably two of these things.
All power measurements are made using a Kill-A-Watt meter behind an HP DPS-800GBA power supply, for some odd reason putting out a loaded 12.65V (12.7V unloaded). Hash measurements are from the management screen on the unit's web interface "GH/S(avg)" box after roughly 10 minutes. Temperatures are in a room where ambient temp was high, around 28C, using the stock (incredibly noisy) fan.
Balls, won't let me actually embed the damn thing...
![](https://ip.bitcointalk.org/?u=http%3A%2F%2F1slickvdc.com%2Fother%2Fmining%2Fs5_chart1.png&t=665&c=kFK-1tLe_eBWeg)
Ouch that is bad efficiency. But most of that is because of the PSU itself so it's hard to say how much of it is due to the voltage. Its interesting still. What PCB version do you have? Its written in top right of the PCB under the bitmain logo.
Anyways basically the interesting point is 400-425, youre able to clock it just a bit higher and stay stable with your over voltage. But you get very bad efficient across the board. The highest i could get was 1315, and then it crash rapidly, while you crash a bit later at high volt. I guess it make sense.
Ultimately you normally would draw 580w at 350 and you're at 700, ouch. Also your efficiency go up and down mine didn't it was a bit better in the account of the the fan draw being the same and actual efficiency being the same.