running my PSU on 240 vs 120v; better? how?

[broken08]

Hello all, I have some generic PSU that says voltage range 100-250v USA. Currently it's a standard USA 120v wall outlet. I am to understand it will run more efficiently on 240v. I'm very familiar with wiring so I guess I just want to confirm if I should, and how I should.

I have an older s7 miner, so I want to run it for all it's worth knowing it will soon be obsolete. I tried a moderate overclock and the plug started melting so I turned it back down. I'm assuming I can clock it back up safely on 240 though, since I was likely just exceeding the 120v wattage. It was nearly 1500w at the wall.

Overclocked or not, is 240v actually better?

I'm assuming I will just get an alternate plug like this https://www.ebay.com/itm/BITMAIN-APW3-220v-240v-HEAVY-DUTY-Power-Cord-Cable-For-Antminer-S9-L3-PSU/132423440999?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D49453%26meid%3D1fb4d5695fc34ae282832a958bf155a4%26pid%3D100678%26rk%3D2%26rkt%3D15%26sd%3D263415048800&_trksid=p2481888.c100678.m3607&_trkparms=pageci%253Ac591d1df-fafc-11e7-a2c1-74dbd18033b8%257Cparentrq%253A00aef3911610a861ef4892f0ffdc3dbd%257Ciid%253A1 and matching outlet setup, run the two hots to the rectangle and neutral to the round plug?

Any thoughts? Thanks!

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[A.Delaney]

Less voltage = more amperage and more amperage = more heat and less efficiency. That’s why your plug started melting. You need to run it on 240v for the best performance.

[broken08]

and is my wiring assumption correct?

I should add there is no 120/240v switch on my PSU. So i assume it just figures it out on it's own? From single to double phase without a switch seems weird to me.

[rifleman74]

and is my wiring assumption correct?

I should add there is no 120/240v switch on my PSU. So i assume it just figures it out on it's own? From single to double phase without a switch seems weird to me.

It figures it out from the plug.   

[A.Delaney]

and is my wiring assumption correct?

I should add there is no 120/240v switch on my PSU. So i assume it just figures it out on it's own? From single to double phase without a switch seems weird to me.

Correct the psu will recognize the voltage. That plug will work fine. Yes the two flats are hot and the round one is ground. No neutral for 220. This is for US. I don’t know about other countries. Red and black are hot. Green is ground. Make sure you get a 2 pole 20amp breaker and use at least 12Ga wire for 20 Amps. One S7 will not pull 20 amps but I haven’t seen a 220 breaker smaller than 20amp and you don’t want to run a breaker that is larger than what the wire can handle.

[broken08]

Thanks all. My questions are answered. I'll update post once done for future researchers.