Thanks again pekatete !!! How hard are you pushing your S3? I have a server room that I can use with A/C! With two power supplies for each miner AX860 ATX Power Supply 860 Watt.
Best I'm doing (not in a server room, but in my garden ... in winter) is freq 282.25 voltage 0825 getting approx 560GH/s and a low HW% running off a single 550W server PSU on a 220v-240v input. Not all my rigs will run that freq, but most will run @ 262.5 (and they all run off 550W server PSU's).