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    Original undervolt suddenly unstable

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by Loney111111, Dec 27, 2014.

  1. Loney111111

    Loney111111 Notebook Deity

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    For the past 6 months, I undervolted my laptop's i7 4500U using XTU. The lowest, stable undervolt that I originally had was -64 mV for core and -84 mV for cache.

    Now I have to drop it to -57mV for core and -64mV for cache after the laptop (Acer Travelmate P645-MG-9419) started BSODing while gaming or crashed upon resuming from sleep mode. This caused the GPU temperature to increase from 60-61C to 64-65C.

    The only changes that I made was that I OCed the Radeon 8750M GPU and installed RadeonPro, though the CPU temperatures only reached a max of 74C. I later undid the GPU overclock when the the laptop became unstable.

    I'm not sure what caused the CPU to suddenly require higher voltage levels when the temperatures weren't excessively high.


    EDIT: Oh wait... I updated the BIOS back when I was diagnosing a different issue, and the BIOs changes were:

    1. Update micro code (could this have destabilized the CPU and thus require a higher voltage?)
    2. Change RF LED behavior
    3. Change Docking's power button behavior-> System can boot up with lid closed under AC mode


    How would I do a BIOS rollback?
     
    Loney111111, Dec 27, 2014
    #1