Intel XTU no longer lets me undervolt after PC factory reset.AN515-54

DeadShot
DeadShot Member Posts: 18 Troubleshooter
edited November 2023 in 2020 Archives
Alright so what happened was I reset my AN515-54 (acer nitro 5) and after installing XTU to undervolt, it no longer lets me use that setting. Like the voltage slider is grayed out. I was able to undervolt -140 before resetting to factory settings. I upgraded BIOS to 1.31 and still no luck.

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Answers

  • GAMING6698
    GAMING6698 ACE Posts: 7,953 Pathfinder
    Answer ✓
    @DeadShot
    Intel disabled undervolting for his mobile intel CPUs.
    windows 10/11 optimization guide for gaming 
    Windows 10/11 optimization guide for gaming — Acer Community

    My AN515-43 laptop UserBenchmark-
    https://www.userbenchmark.com/UserRun/51514566
  • DeadShot
    DeadShot Member Posts: 18 Troubleshooter
    @DeadShot
    Intel disabled undervolting for his mobile intel CPUs.
    Throttlestop works though?
  • GAMING6698
    GAMING6698 ACE Posts: 7,953 Pathfinder
    edited December 2020
    @DeadShot
    Throttlestop will not work because you upgraded bios.
    windows 10/11 optimization guide for gaming 
    Windows 10/11 optimization guide for gaming — Acer Community

    My AN515-43 laptop UserBenchmark-
    https://www.userbenchmark.com/UserRun/51514566
  • DeadShot
    DeadShot Member Posts: 18 Troubleshooter
    @DeadShot
    Throttlestop will not work because you upgraded bios.
    It does, I am currently using throttlestop for undervolting. It works because it brought my temps down and I checked using Cupuid
  • @DeadShot
    Then new bios coming soon to disable undervolting for your laptop.

    If you want to take advantage of undervolting in future also then from now onwards never update your bios.
    windows 10/11 optimization guide for gaming 
    Windows 10/11 optimization guide for gaming — Acer Community

    My AN515-43 laptop UserBenchmark-
    https://www.userbenchmark.com/UserRun/51514566
  • DeadShot
    DeadShot Member Posts: 18 Troubleshooter
    @DeadShot
    Then new bios coming soon to disable undervolting for your laptop.

    If you want to take advantage of undervolting in future also then from now onwards never update your bios.
    undervolting is so good why is it being disabled
  • @DeadShot
    Found this-

    There is no one catch-all here, but the reasoning behind disabling undervolting is Plundervolt, an exploit discovered by the University of Birmingham. You can read the research team's findings in its research paper, which can be found here. In summary, Plundervolt exploits Intel Software Guard Extensions (SGX), which is a set of instruction codes that undervolting programs like Throttlestop and XTU use to manipulate CPU voltages. According to Intel, all of its desktop and mobile processors from 6th generation Core processors onwards are affected, as are Core X-series and recent Xeon E chips.

    Intel has since addressed the exploit by allowing OEMs to disable undervolting via a firmware update. You can read Intel's response and the details of the CVE-2019-11157 vulnerability here. Going forward, it would seem that all new Intel devices do not support undervolting. Anecdotally, the Surface Book 3 15 does not support undervolting, which uses an Intel Core i7-1065G7 processor. The same should apply to upcoming Tiger Lake laptops, too.

    windows 10/11 optimization guide for gaming 
    Windows 10/11 optimization guide for gaming — Acer Community

    My AN515-43 laptop UserBenchmark-
    https://www.userbenchmark.com/UserRun/51514566
  • DeadShot
    DeadShot Member Posts: 18 Troubleshooter
    @DeadShot
    Found this-

    There is no one catch-all here, but the reasoning behind disabling undervolting is Plundervolt, an exploit discovered by the University of Birmingham. You can read the research team's findings in its research paper, which can be found here. In summary, Plundervolt exploits Intel Software Guard Extensions (SGX), which is a set of instruction codes that undervolting programs like Throttlestop and XTU use to manipulate CPU voltages. According to Intel, all of its desktop and mobile processors from 6th generation Core processors onwards are affected, as are Core X-series and recent Xeon E chips.

    Intel has since addressed the exploit by allowing OEMs to disable undervolting via a firmware update. You can read Intel's response and the details of the CVE-2019-11157 vulnerability here. Going forward, it would seem that all new Intel devices do not support undervolting. Anecdotally, the Surface Book 3 15 does not support undervolting, which uses an Intel Core i7-1065G7 processor. The same should apply to upcoming Tiger Lake laptops, too.

    Wow, why can't manufacturers keep the CPU voltage low? If I dont undervolt my CPU temp will go beyond 85c during gameplay. I mean I dont really understand what plundervolt is but I know that nothing bad has happened to my laptop so far after undervolting since April, 2020.