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  1. #1
    New ROGer Array
    Join Date
    Apr 2020

    Maximus XI Apex+9900KS can't selectively disable C-States (C7)

    Hi everybody. I've just bought a Maximus XI Apex replacing a Gigabyte Aorus Master that encountered countless problems with memory overclocking. My CPU is a 9900KS, I'm overclocking it to 5.1GHz with Adaptive Voltage. I'd like to keep C1e and C3 states enabled while disabling only the C7 state, because I know (from my previous experience with the other board) that it generates instability at medium loads (typically with L0 Cache errors reported in HWInfo). With my Gigabyte board I could simply disable the C-States I didn't want, but with this board it seems that I can only disable all of them or have them all enabled, no matter which ones I manually activate and which ones I manually deactivate. For example, if I disable "CPU C7 report" in BIOS HwInfo and Throttlestop still register C7 State as operating, and the only way to disable it is to completely disable C-States in BIOS. How is it possible that I cannot deactivate them selectively? Is this a BIOS bug or am I missing something? If you could share your experience with other Maximus XI motherboards it would be great. Thanks in advance!

  2. #2
    ROG Guru: Yellow Belt Array Carlyle2020 PC Specs
    Carlyle2020 PC Specs
    MotherboardAsus Maximus XI APEX
    Processorgaming9900ks@5.2/avx 0/ adaptive vcore / 1.35+0.020 offs/LLC5/ac ll 0.01/TVB off/power saving on
    Memory (part number)Gskill 4400 CL16 /65k r /65k w / 60k c
    Graphics Card #13080 ftw ultra /pads on backplate
    Sound CardXonar STXII mods:3xLME 49720NA
    MonitorLG 38GL950G / -HDR / +madVR
    Storage #12TB 970evo plus nvme
    Storage #21TB 960evo nvme +2x 1tb evo 860 hw-sata-raid
    CPU Coolerarctic freezer II 280
    CaseUnique Silverstone FT2 dampened up the wazoo V2.0
    Power SupplySeasonic TX-850
    Keyboard Cherry KC 1000 on top of a cherry MX1 for ergonomics :)
    Mouse MX Master 3
    Headset Sennheiser PC360 + Philips X2HR
    Headset/Speakers A250 / cause LG was stingy
    OS Win 10 64bit
    Network Routeryeah right...
    Accessory #1 Silverstone EBA01 headphone stand / black
    Accessory #2 radio Keyfob to turn on and off
    Accessory #3 4 bay fantec /10tb red/+scrap

    Join Date
    Mar 2018

    I can replicate what you are writing.
    But i lack experience in this matter with c-states in regards to overclocking.
    I just blindly found "Package C state Limit" and wanted to point it out. Maybe it is of relevance.

    If you have OC questions besides c-states i might be able to contribute more.

    Best regards

  3. #3
    New ROGer Array
    Join Date
    Apr 2020

    Thanks for the answer! I ended up disabling C-States completely as with Speedstep/Speedshift left on voltage and frequency drop at idle anyway. Just curious to know if it's a bug, maybe I should contact the technical support.

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