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Modern quality PSUs do not have a 110/220v switch. If you're still using one of those PSUs, it is time to update. Modern PSUs with active PFC automatically adjust for voltage ranges from 90 to 240 volts.
I hadn't really checked - it's a enermax max revo 1200w so it should be pfc.
Is there a benefit to running 220v outside efficiency?
I've worked with 4 kW 220v three phase power supplies. They're as big as a mid tower PC case and weigh 150 lb. When they decide to say "fuck you, I'm done here", it's usually a spectacular show with explosions, fire and balls of liquid metal being ejected out of the unit yards away.
That sounds awesome and terrifying at the same time...