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  1. #1
    ROG Junior Member Array
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    Cool Better setup for OC G.Skill 4800mhz CL20-30-30-50

    Good morning,

    I have the following setup:

    MB: MB ATX Asus ROG Crosshair VIII Hero (Wi-Fi)
    PSU: ATX Asus ROG Strix 850W 80 Plus Gold Full Modular
    CPU Cooler: iCUE H100i H115i H150i Elite Capellix
    CPU: AMD Ryzen 9 5900x
    Memory Bios OC: D.O.C.P.
    Bios Version: Last stable version 4006
    RAM Memory Kit: G.Skill Trident Z RGB DDR4-4800 CL20-30-30-50 1.55V 32GB (2x16GB) - F4-4800C20D-32GTZR - F4-4800C20D-32GTZR - G.SKILL International Enterprise Co., Ltd.

    Is it possible to reach 4800mhz with my setup above? What should I change?

    Mobo accept setup even higher than 4800mhz OC.
    I tried the standard D.O.C.P. profile and my computer keeps rebooting reporting as unstable configuration.

    Standard D.O.C.P profile:
    Voltage: 1.55v (1.53v at bios read)
    Frequency: 4800mhz
    Latency: 20-30-30-50

    I was able to reach 4400mhz with the same configuration above, but benchmark reported 1 memory error and then I came down to 4333mhz.

    I am currently using:
    Voltage: 1.55v (1.53v at bios read)
    Memory Frequency: 4333mhz
    BCLK Frequency: 100.0000
    FCLK Frequency: Auto (2166mhz at benchmark read)
    Latency: 18-27-27-47
    PowerDown: Disabled
    BGS: Disabled
    BGS Alt: Enabled
    GDM: Enabled
    VSOC: Auto (1.11v at bios read)

    Memories are at slot B2 (16GB) and A2 (16GB) as specified at motherboard manual.

    Is there something else that I could do to reach the 4800mhz having my system stable? Or any other configuration to have a better OC setup even bellow the 4800mhz?

    Thank you in advance.

  2. #2
    Administrator Array Silent Scone@ROG's Avatar
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    Mar 2016
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    Hello,

    Speeds above 4000MHz require Gear 2 which runs the Fabric Clock asynchronously. The best CPU performance is found running in 1:1 ratio with the FCLK (Fabric Clock). 4800 is also the maximum validated ratio for the Crosshair VIII. Even if wanting to run asynchronously with FCLK, I'd normally recommend buying a kit below the maximum validation for an easier time tuning.


    I would aim for a tight 3600-3866 if the CPU will allow you.
    Last edited by Silent Scone@ROG; 06-07-2022 at 05:57 AM.

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