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AMD says Windows 11 is slowing down its processors by up to 15%

AMD users who have upgraded their devices to Microsoft's new Windows 11 operating system or purchased a new AMD-powered device with Windows 11, may be impacted by an issue that may cause performance to drop by up to 15%.

AMD published a new support article on its website that provides details on the issue. According to AMD's document, performance may be impacted on Windows 11 devices for all compatible AMD processors, including the company's Ryzen 3, 3 Pro, 5, 5 Pro, 7, 7 Pro, Ryzen 9, Ryzen 9 Pro, Ryzen 9 Threadripper, and Epyc processors.

AMD users may check Microsoft's official list of supported processors to find out if their CPU is affected by the performance issue on Windows 11.

It is unclear if unsupported processors are also affected, as it is possible to install Windows 11 on systems deemed incompatible by Microsoft, but it is very likely that these are also affected.

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AMD notes that the expected performance impact is 3% - 5% in affected applications, but that it may go up to 15% in games "commonly used for eSports". A second issue in UEFI CPPC2 may "not schedule threads on a processor's fastest core", which may also impact performance in certain applications.

Known Performance Changes
ImpactResolution
Measured and functional L3 cache latency may increase by ~3X.Applications sensitive to memory subsystem access time may be impacted.
Expected performance impact of 3-5% in affected applications, 10-15% outliers possible in games commonly used for eSports.
A Windows update is in development to address this issue with expected availability in October of 2021.
UEFI CPPC2 (“preferred core”) may not preferentially schedule threads on a processor’s fastest core.Applications sensitive to the performance of one or a few CPU threads may exhibit reduced performance.
Performance impact may be more detectable in >8-core processors above 65W TDP.
A software update is in development to address this issue with expected availability in October of 2021.

AMD notes that the issues are investigated by Microsoft and AMD, and that software updates are in development. The company expects these updates to be released in October 2021 as a Windows update and a software update. The Windows update will resolve the L3 cache issue, which appears to be the more serious issue, and that a software update will resolve the UEFI CPP2 issue.

A workaround is not available at the time. AMD suggests that customers use Windows 10 whenever possible instead as the operating system is not affected by the issue. (via Deskmodder)

Summary
AMD says Windows 11 is slowing down its processors by up to 15%
Article Name
AMD says Windows 11 is slowing down its processors by up to 15%
Description
AMD users who have upgraded their devices to Microsoft's new Windows 11 operating system or purchased a new AMD-powered device with Windows 11, may be impacted by an issue that may cause performance to drop by up to 15%.
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Ghacks Technology News
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Comments

  1. Alan said on October 7, 2021 at 9:32 am
    Reply

    I wonder if Windows 11 is slowing down the Intel processor too? By the way I will never use Windows 11. Will be sticking with Widows 10 Enterprise LTSC 1809 which will receive update support until January 9th of 2029.

    1. Yuliya said on October 7, 2021 at 1:39 pm
      Reply

      VBS will have a perf penalty on every CPU, Intel, AMD or ARM/Q.comm. If it’s something else, it might impact strictly the chiplet style CPUs which most Zen CPUs use.

  2. common sense computing said on October 7, 2021 at 2:01 pm
    Reply

    That’s a nice one-two punch of crippled productivity with the garbage taskbar, and crippled performance.

  3. John G. said on October 7, 2021 at 2:02 pm
    Reply

    I have noticed no performance decrease in my AMD CPU, anyway the new taskbar of Windows 11 is a complete unforgivable sin, too much worse that any CPU issue. It hurts the eyes, it slows down user’s behaviour with no choice but applying weird tweaks with Regedit. In my opinion, releasing W11 with this weird taskbar (too wide, with some bugs, with no option to put it on top of the screen and so forth other issues is the major shame that I have ever seen). Poor W10, you good OS! :[

    1. Trey said on October 8, 2021 at 12:57 am
      Reply

      I agree. Hopefully app makers like Startisback or Stardock will create solid UI improvements. Fixing Microsoft’s shortcomings is a cottage industry.

      1. John G. said on October 8, 2021 at 10:12 am
        Reply

        You are right, however I have decided to revert to W10. After three days using W11 it’s a fact for me that I can’t work with the weird half baked taskbar permanently locked at the bottom of the screen. I got tired of the high number of misclicks done per sesion. MS team, what have you done? Even Ubuntu has better taskbar, for the God’s sake! :[

  4. Leonard said on October 7, 2021 at 2:03 pm
    Reply

    Microsoft and Intel are buddies for life. Of course Windows 11 would reduce AMD’s performance.

  5. John G said on October 7, 2021 at 3:08 pm
    Reply

    Another bug with the W11 taskbar, if you pass the point of the mouse over battery icon and then you move the mouse over other sections of the taskbar, you will see a ghost ballon over. Any time, at any section of the taskbar! Taskbar deserves an entire article itself. LOL xD

  6. user.45 said on October 7, 2021 at 3:37 pm
    Reply

    I’m locked on a Ryzen 1700 and no desire to upgrade. Microsoft don’t support it and AMD is letting us first gen users on the sand. A bat start since the beginning.

  7. eWaste11 said on October 7, 2021 at 10:38 pm
    Reply

    Why would anyone downgrade to this alpha product?

    1. Anonymous said on October 8, 2021 at 12:57 am
      Reply

      Kids like shiny new toy

  8. Maxwell said on October 8, 2021 at 6:13 am
    Reply

    Not surprising, Windows 11 is trash.

  9. Marin said on October 8, 2021 at 10:15 pm
    Reply

    Win 10 KDE
    Win 11 even more KDE

  10. the_LAST_bull$hit_from_micro$hit said on October 9, 2021 at 11:04 am
    Reply

    Put this in your calendars: this will be the LAST bull$hit release from micro$hit…

  11. Chris said on October 9, 2021 at 4:33 pm
    Reply

    I’m using an AMD FX(tm)-8150 Eight-Core Processor 3.61 GHz with 24GB of ram from 2011 with Windows 11. My machine runs just fine. I even run Microsoft Flight simulator on it with a Geforce GTX 1070.

    My problem is browser heat. When my machine is idle with liquid cooling I’m running 26-34c. As soon as I open a webpage like CNN.com for example with video advertisements the temperatures shoot up to 45-50c. Now if I open another tab or a more demanding tab like a 4k video in Youtube I am seeing 75c. That is insanity. I don’t even get that in gaming. As soon as I close the browser it goes back down to the 30’s. I’ve tried every Edge, Chrome, Opera, Firefox. Same results.

    Anyone else having this CPU heat issue while browsing in Windows 11?

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