I have undervolted my Antminer to 1,0V (R3 = 3.9kOhm) and I am really happy with results. Before mod my antminer was consuming 348W on the wall on 180GH/s but now it takes only 260W on 165GH/s.

So 8,3% performance decrease means 25.3% power input decrease. Nice

I am running about hour now and no HW errors at all. I also tried 180GH/s with lowered voltage, but a lot of HW errors resulted in 170GH/s output performance too.

Mod was really easy. 10 minutes of work and everything worked on the first try.

Thanks for the guide.