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  1. #1
    New ROGer Array
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    Should I connect the second 4 pin CPU

    Hello,
    I've just left my i9 9900k for the AMD platform, now I have an Asus X570-f ROG Gaming with 3900X and I've currenly only connected the 8-pin CPU cable (+ the 24 for sure!)

    I was wondering if I really need to connect the 4 pin CPU as well and what it changes .
    Thanks

  2. #2
    New ROGer Array Murph_9000 PC Specs
    Murph_9000 PC Specs
    MotherboardROG Crosshair VIII Extreme
    ProcessorAMD Ryzen 5950X
    Memory (part number)Crucial Ballistix DDR4-3600 CL16 (BL16G36C16U4B.M16FE1)
    Graphics Card #1ROG Strix Radeon™ RX 6750 XT OC Edition 12GB GDDR6
    MonitorROG Strix XG43UQ, XG27AQM
    Storage #1Seagate FireCuda 530
    CPU CoolerROG Ryujin II 360
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    Power SupplyROG Thor 1200W Platinum
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    It's theoretically optional, but can be required if you want to push your CPU. For example, my 5950X has a stock power of something like 105W. With PBO2 enabled and the limits raised/removed (configured as +200 boost, 395W PPT, 255A TDC, 200A EDC, -25 all core CO; everything else on auto, roughly), it can run around 150-200W with just AIO cooling (that's roughly a sustained all core 4400MHz, or sustained 4700MHz on a few cores with peaks of about 5000MHz; over the baseline stock frequency of 3400MHz). The optional 2nd power connection helps the board supply that and cope with any spikes in demand. If your PSU has a spare output that you can easily connect, do it; it can help the combination of board and chip deliver peak performance. If it's a problem to connect it, you can live without it but possibly won't be able to reach as high stable performance.

    There's really no reason not to connect it if you have the PSU output and a cable to do so. It's only ever a good thing, even if you don't intend to do more than basic boost with stock limits.

  3. #3
    New ROGer Array
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    Quote Originally Posted by advapi View Post
    Hello,
    I've just left my i9 9900k for the AMD platform, now I have an Asus X570-f ROG Gaming with 3900X and I've currenly only connected the 8-pin CPU cable (+ the 24 for sure!)

    I was wondering if I really need to connect the 4 pin CPU as well and what it changes .
    Thanks
    Try to connect then you can confirmed

  4. #4
    Administrator Array Silent Scone@ROG's Avatar
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    Hello,

    A 8-pin EPS12V CPU connector can draw over 235W. If you're able to trip OCP on a 5950X with a single EPS12V you're going in hard

    In short, it's not necessary unless going sub-ambient.

  5. #5
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    Talking

    I've connected it (it was alone in the psu box in the cellar)...for now no problem at all !

  6. #6
    ROG Guru: Yellow Belt Array Baio73 PC Specs
    Baio73 PC Specs
    MotherboardAsus ROG Crosshair VIII Extreme BIOS 0606
    ProcessorAMD Ryzen 5900X
    Memory (part number)2x16Gb Corsair Dominator 3600 CAS14
    Graphics Card #1AMD RX 6900 XT
    MonitorLG 34GK950F
    Storage #1Samsung 980PRO 512Gb NVMe
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    CaseLian Li 011D XL
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    Quote Originally Posted by advapi View Post
    I've connected it (it was alone in the psu box in the cellar)...for now no problem at all !
    AFAIK it can do no harm... at least it does nothing and you have 1 more cable to root in your case.

    Baio
    CASE Lian Li 011D XL CPU AMD Ryzen 5900X COOLER Corsair H150i Elite Capellix MOBO Asus ROG Crosshair VIII Extreme RAM 2x16Gb Corsair Dominator 3600 CAS14 PSU Asus Thor 1200P VGA AMD RX 6900 XT DISPLAY LG 34GK950GF AUDIO Logitech G560 SDD Samsung 980PRO 512Gb NVMe - Seagate FireCuda 530 NVMe 1Tb - WD Black SN850 2Tb NVMe NPUT Logitech ProX Superlight + Powerplay + Corsair MM700 RGB - G513

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