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Thread: 4 Pin Purpose

  1. #1
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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.
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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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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    ehume (05-06-2017)

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