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  1. #1
    ROG Member Array contact1 PC Specs
    contact1 PC Specs
    MotherboardAsus CROSSHAIR VIII Hero (WiFi)
    ProcessorAMD Ryzen 3950X
    Memory (part number)G.Skill Trident Z Neo (2 x 16 GB) DDR4-3600 CL16 (F4-3600C16D-32GTZN)
    Graphics Card #1MSI GeForce GTX 570
    MonitorDell U2711 Ultrasharp
    Storage #1Sabrent Rocket HTSK 4.0 1 TB M.2-2280
    CPU CoolerFractal Design Celsius+ S36 Dynamic X2
    CaseFractal Design Define 7 Light ATX Mid
    Power SupplySeaSonic FOCUS 850 W 80+ Gold
    OS Linux

    Join Date
    Aug 2018
    Reputation
    10
    Posts
    7

    [SOLVED] CROSSHAIR 8 X570 : Quest for a perfect Base Clock of 100 MHz

    Hello,

    I'm measuring the BCLK of the Ryzen 3950X using its Core TSC
    ( an algorithm of two instructions RDTSCP elapsed by one second )

    Results are 99.8 MHz on any Core, which is lower than the Processor factory 100 MHz.

    After refining my TSC measurements by removing the inherent cycles of RDTSCP, setting the P-State to a fixed ratio, and all possible programming improvements; I'm still getting a estimated Base Clock of 99.8 MHz.

    Thus I have questioned the BIOS and I went into the UEFI settings to change the BCLK from 100 to 100.0625 MHz (the first step above 100) ; save, reboot, and measure the TSC to get a coherent frequency of Cores at ~ 3502.2 MHz (35 * 100.0625)

    Next, I changed back into UEFI the BCLK from 100.0625 to 100.0 MHz ; save and went straight into measurements to get an almost perfect Cores frequency of 3500 MHz

    Unfortunately, the following boots restored the BCLK to an estimation of 99.8 MHz

    Question is how to manage the BIOS to retain the willing Base Clock of 100 MHz ?

    Click image for larger version. 

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    Last edited by contact1; 09-01-2020 at 06:53 AM. Reason: Marked as solved

  2. #2
    ROG Member Array contact1 PC Specs
    contact1 PC Specs
    MotherboardAsus CROSSHAIR VIII Hero (WiFi)
    ProcessorAMD Ryzen 3950X
    Memory (part number)G.Skill Trident Z Neo (2 x 16 GB) DDR4-3600 CL16 (F4-3600C16D-32GTZN)
    Graphics Card #1MSI GeForce GTX 570
    MonitorDell U2711 Ultrasharp
    Storage #1Sabrent Rocket HTSK 4.0 1 TB M.2-2280
    CPU CoolerFractal Design Celsius+ S36 Dynamic X2
    CaseFractal Design Define 7 Light ATX Mid
    Power SupplySeaSonic FOCUS 850 W 80+ Gold
    OS Linux

    Join Date
    Aug 2018
    Reputation
    10
    Posts
    7

    Disabling SPREAD SPECTRUM has solved the issue. I did it on VRM and SB and now my BCLK perfectly reports 99.9 - 100 MHz

    Click image for larger version. 

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    CoreFreq monitoring at github.com/cyring/CoreFreq
    Last edited by contact1; 09-01-2020 at 06:51 AM.

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