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Thread: PSU that uses copper output wires

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    Question PSU that uses copper output wires

    From the PSU's i've opened/repaired, all of them use steel conductors for the +12, +5, +3.3V, etc output wires.
    Also, i've never read any review that says whether that PSU uses copper or steel output wires.

    Everyone knows that copper has a lower resistance than steel and is more flexable, so why do manufacturers use steel?
    Surely copper wire can't cost the manufacturer that much than steel wire?

    Even the 700W Seasonic PSU I used for the gaming computer I built for a friend a couple years ago uses steel conductors.

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    They don't use steel but aluminium.

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    How do you know it's steel not copper covered with tin?
    It's been a hard day's night and I've been working like a dog.

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    Aluminum conducts about a factor of 10 better than steel.

    Steel is not used.

    Copper = 3x cost of Aluminum.

    Simple cost benefit analysis. Use Aluminum when you can to reduce costs.

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    high end crimp terminals use

    1. copper alloy + tin
    2. copper alloy + Gold (Au) selective...

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    definitely not Aluminium because it has worse thermal properties. Alumunium oxidation forms a resistance which causes heat. Copper oxidation, on the other hand, is a conductor.

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    The wires are copper with tin plating. The ends are copper with either tin or gold plating.

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