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Thread: 4 Pin Purpose

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    Default 4 Pin Purpose

    What exactly does the square 4 pin connector from the power supply to the mother board do? I accidently switched the computer on with this connector disconnected and everything seemed to work just fine. And I checked all the fans and they are running.

    Surely this must have some purpose. Thanks for your help.

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    It provides extra power to the CPU since the 24-pin only has two +12V leads.

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    Thanks for the info; I was sure it must have some purpose. I will be sure to always have it connected in the future.

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    I know when I don't have that connected because while everything runs when I turn the system on, it won't boot -- no power to the CPU.
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    Some motherboards rely exclusively on that connector for CPU power. Others don't.

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    Default

    Or he has a motherboard with an 8 pins EPS and a 4 pins ATX12V connector and both are connected. Then if he disconnects the 4 pins ATX12V it still works perfect, because the 4 pins ATX12V isn't necessary.

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