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Thread: Z87 Extreme4 BCLK drop




  1. #1
    Join Date
    Oct 2013
    Location
    Odessa, Ukraine
    Posts
    2

    Question Z87 Extreme4 BCLK drop

    Hi all!
    I have received recently Z87 Extreme4 for my new 4670k, and after some tests i was disappointed by bus speed value under full load (cpu-z and aida64 measured).
    When idle, bclk frequency is around 100 (99.7-99.8).
    But when i launch heavy tasks, bclk drops to 94-95 mhz, which makes processor running at 4200mhz with multiplier set to 44.
    Firmware version is 2.30

    I this a motherboard or software problem?



    Last edited by crz; 10-06-2013 at 11:46 PM.

  2. #2
    Join Date
    Oct 2013
    Location
    Odessa, Ukraine
    Posts
    2

    Default Re: Z87 Extreme4 BCLK drop

    Solution found!

    Enabling Hyper-V role in Windows 8 Pro apparantly causes this bus speed reporting issue. Perhaps there's some sort of hardware abstraction layer going on under the covers when Hyper-V is enabled that causes CPU-Z and HWiNFO64 and a few other utilities to read a synthetic bus speed instead of the actual hardware registers.

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