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    New ROGer Array Nerror PC Specs
    Nerror PC Specs
    Memory (part number)CMK32GX4M2F4000C19
    Graphics Card #1EVGA GTX 1080Ti FTW3 GAMING
    Storage #1Crucial M4 256GB
    CPU CoolerNoctua NH-D15
    CaseCorsair 650D
    Power SupplyCorsair AX850
    Keyboard Logitech G15
    Mouse MADCATZ MMO7
    Headset Beyerdynamic MMX300
    Mouse Pad Razer eXactMat Xspeed
    OS Windows 10 Pro
    Accessory #1 Belkin n52te

    Join Date
    Oct 2017

    How far can I safely push VCCIO and VCCSA on the Maximus X Hero WIFI AC?

    And by safely I mean no real degrading over the next 5 years.

    System specs as listed in the postbit to the left.

    I currently have a stable 5.1GHz OC with RAM at 3466MHz. VCCSA manually set to 1.25v, shoots up to 1.28v under load. VCCIO manually set to 1.20v, shoots up to 1.24v under load. Those are the lowest voltages I can get and still be stable.

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    From Raja's own Kabylake OC guide I can read this:

    For memory speeds over DDR4-3600 or if using high-density memory kits, voltages up to 1.35V (VCCSA) may be required. Some CPUs have “weak” memory controllers that require elevated voltages to maintain stability. If possible, do not venture too far from 1.35V as a maximum.
    And there's a table with suggested voltages on this page:, which suggest the same maximum for VCCSA and a max of 1.30V for VCCIO.

    But then I read other guides like this one:, where they write this:
    Safe Voltages (Always TENTATIVE):
    Vcore: 1.45v/1.37v
    VCCIO: 1.25v/1.2v
    System Agent (SA): 1.3v/1.25v
    Vdimm: 1.4v/1.35v

    The first value shows voltages a pretty ballsy person can use. The voltage after the forward slash shows voltages for regular users who don't want to live on the edge.
    And another guide goes even lower:
    For VCCIO/VCCSA, I do not recommend exceeding a value of 1.25v for each. I personally use a value of 1.14v for VCCIO, and 1.15v for VCCSA. Going beyond 1.25v is silly, and may potentially damage your IMC or traces on your board.

    While I am inclined to believe an Asus guy like Raja more, the guide was mainly for the Kaby Lake on the Z270 board. Also, that guide doesn't really touch on the consequences of going that high. So I am hoping there's someone here with actual knowledge of this on the 8700K + Z370 Maximus X Hero combo.

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