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Im lazy, someone out there knows the answer..

is one any cheaper to run ?   240v as opposed to 120v AC

amperage * voltage = wattage

Or put another way

wattage / voltage = amperage

The main point to take away from this is that the higher the voltage, the lower the amperage.

Example: You have a rig pulling 1200 watts. At 120 volts this rig would be pulling 10 amps (1200/120=10). If you put the rig on 240 volts your amperage requirement is cut in half (1200/240=5). So if you have a 40 amp breaker on 240v, it is the equivalent to having 80 amp breaker on 120v.

Most PSUs can run on any voltage from 115 to 240 volts as they are designed to run on just about any electrical system in the world. Also, PSUs generally run a bit more efficient at higher voltages, generally 3%.

According to my PSU owners manual, my PSU is more efficient at 240v vs 120v.

Thanks guys, from what little I know about transformers, I suspected as much..

This is why my rack of rigs runs 240v. Dual 30amp 240v L6-30p :)

Same here. The electrical will be done tomorrow for my 208v setup on three phase commercial power. Three phase also has the added benefit of spreading the load over three power wires and as more load is added, the net effect is a decrease in amperage of 1.73 at the main fuses. This effectively means that a three phase 200 amp service can run close to 57kw per hour at 80% capacity (57000w / 208 / 1.73 = 158.4 amps).

Typically a higher voltage setup is more efficient because the current is lower, thus I^2xR losses are less.