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  1. #1
    ROG Enthusiast Array
    Join Date
    Jul 2017

    Question on what pressing the CMOS button actually does?

    56 posts
    Posted 7 minutes ago

    My motherboard is a Asus Dark Hero

    Hey guys, been searching online and got multiple answers on what the cmos button does when you press it/hold it down

    1. It resets your motherboard setting to default settings on your CURRENT bios

    2. It resets your motherboard bios version to the FACTORY version

    3. I clears your cmos chip to factory settings and version just like when you first got it

    Also I have a few more questions please to clear up any confusion:

    4. Is there any difference between the following methods of resetting BIOS (clearing CMOS) settings:

    a.inside BIOS, using option "Load Optimized Defaults" (or, if applicable, load fail-safe defaults)

    b. At the back of the motherboard, pressing , Clear CMOS" button

    c. On the motherboard, using the (CLRTC) jumper

    d. On the motherboard, reseating (not a typo, for non-english speakers) the CMOS battery

    e. Reflashing BIOS using the same version

    my last question is:

    **5. After flashing a newer, same, or older BIOS, is there a need to load optimized defaults and then start setting everything up from there

    Thank you again everyone! I appreciate it!
    Last edited by Planetgazer11; 02-17-2021 at 02:33 AM.

  2. #2
    ROG Enthusiast Array neotokyo PC Specs
    neotokyo PC Specs
    MotherboardROG Crosshair VII Hero
    ProcessorAMD R5 3600
    Memory (part number)2x8GB Ballistix Sport LT (BLS8G4D240FSC) @3200Mhz
    Graphics Card #1RTX 2070 WINDFORCE 8G
    MonitorLG 27UL650-W
    Storage #1WD Blue M.2 SATA 500GB
    Storage #2TOSHIBA P300 3TB/Crucial MX300 256GB
    CPU CoolerBe Quiet Dark Pro 4
    CasePhantek P600s
    Power SupplySeasonic Prime Ultra Platium 650W
    Mouse Logitech G403/502 Hero
    OS Windows 10

    Join Date
    Jun 2016

    What you ask should be in the manual. The Clear CMOS button clears/reset the bios nvram, which mean that it resets the bios to default settings. It doesn't revert the bios to a previous "factory" version, whatsoever.

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