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Undervolt settings Z390 Phantom ITX?

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  • Undervolt settings Z390 Phantom ITX?

    Hi, I am looking for a guide that I am able to understand. Can anyone help me with a step-by-step guide, screenshots etc?
    I have:

    -Z390 Phantom Gaming-ITX/ac
    -I7 8700k 3,6GHz
    -32GB RAM 3200Mhz
    -Samsung 970 EVO SSD (2 x - no spinning drives)
    -Radeon RX580 GPU
    -Scythe Big Shuriken 2 CPU cooler (Conductunat liquid metal thermal paste)
    -Louqe Ghost S1 case
    -Corsair SF600W PSU
    -2 x Noctua 12X15 in top to force air from sides to CPU and to GPU

    Here is what I want:
    -A quiet as possible setup
    -4.5Ghz OC
    -I will be using the setup for light work but it is ok that the fans blow when I need the power (4.5Ghz OC)

    I saw some videos from Optimum Tech about undervolting to get a cooler CPU. But I do not understand where I set this up in BIOS. Are there any simple steps to e.g. set undervolt to 1.15V?

    My questions are then:
    - How do I get the fans to run super quiet when the CPU is not stressed?
    - How do I best set an OC of 4.5GHz on my i7 8700k?
    - How do I set an undervolt of the CPU that I can control (if I set it too low I understand I will get crashes)