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AMD: Windows 11 will reduce our CPU speed by as much as 15%, and a patch is coming soon


AMD has Announce When used with a new operating system, the performance of all its WINdows 11-compatible processors in certain applications may be reduced, and extreme abnormal values ​​in e-sports games cause performance degradation of up to 10-15%. For applications, AMD says that the performance impact is 3-5%.Software update with Windows Update is working hard to resolve these issues, and both are expected to be launched in October 2021 (this month).

These errors affect every Ryzen CPU supported by Windows 11. This means that all Zen+, Zen 2 and Zen 3 CPUs Ryzen 2000, Ryzen 3000, Ryzen 4000 and Ryzen 5000 processor. In addition, some AMD EPYC processors used in data centers and some newer Athlon chips are also can see The full list is here, But it’s enough to show that each of our AMD chips The most suitable CPU for gaming The list is included.

AMD’s recommendation says that this problem comes down to two categories. First, the measured and functional L3 latency may increase by about 3 times, which means you can see the impact of the measurement utility and cause the actual performance of games and applications to degrade. This bug affects applications that are sensitive to the latency of the memory subsystem, resulting in a 3-5% performance degradation. This issue can also cause 10-15% performance degradation abnormal values ​​in games “usually used in e-sports”, which is not surprising considering that games are often extremely sensitive to memory and cache latency.

(Image source: AMD)

In addition, AMD’s “Preferred Core” feature (directing single-threaded applications to the two fastest cores on the chip) may not work as expected. This will mainly affect the performance of light-threaded applications. AMD said that this performance degradation may be more pronounced in chips with 8 or more cores and a TDP rating of 65W or higher.

We contacted AMD on this matter, and the company stated that there is no more information to share. However, the announcement stated that AMD and Microsoft are “actively investigating these known issues to resolve them through software updates,” and AMD will update their announcements when they become available. AMD also recommends that customers experiencing problems can “continue to use a supported version of Windows 10”, which means that it may not be wise to upgrade to Windows 11 before the problem is fixed.

It is worth noting that this issue seems to be different from the performance issues surrounding the VBS and HVCI security settings recommended by Microsoft that have caused strong protests.US Test these issues earlier this week.

AMD said that it hopes that Windows Update can solve the L3 cache problem, and the software update will fix the issue of UEFI CPPC2’s preferred core technology. Both are expected to arrive this month. We will update you when we learn more.

  • The measured and functional L3 cache latency may increase by about 3 times.
  • Applications that are sensitive to the access time of the memory subsystem may be affected.
  • The expected performance impact of the affected applications is 3-5%, and there may be 10-15% outliers in popular e-sports games.
  • UEFI CPPC2 (“Preferred Core”) may not prioritize scheduling threads on the processor’s fastest core.
  • Applications that are sensitive to the performance of one or a few CPU threads may exhibit performance degradation.
  • In processors with more than 8 cores above 65W TDP, the performance impact may be more pronounced.


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