1.5 gpm would be ideal.
If your PSU wires get hot, that'll be because the power connector on the mobo is making poor contact. You should focus on that (use conductive grease, tighten up /re-seat the connectors,etc...). The heat then travels up the wires.
In very rare cases, the wire itself can be overloaded, but I don't believe that to be the case.
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