Windows 11 is causing 'reduced performance' for some AMD chips

Warning that some AMD processors may see performance drop by up to 15% when running specific applications.

Windows 11: Everything you need to know

Processor chip maker AMD is reporting that Windows 11 on hardware with its processors could see performance degradation when running some applications. 

Microsoft released Windows 11 to the masses this week. It got a major visual refresh but also is mostly restricted to newer hardware, which improves security benefits but also means a slower rollout.   

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Despite a year of testing with Windows Insiders, AMD and Microsoft have now disclosed that there may be as much as a 15% hit on performance after installing Windows 11 on AMD processors, such as its EPYC and Ryzen line. The size of the impact depends on what applications are running, and it affects games more severely.  

See also: Windows 11 upgrade: Five questions to ask first.

"Expected performance impact of 3-5% in affected applications, 10 - 15% outliers possible in games commonly used for eSports," AMD explains in a support note

The note documents "known performance impacts reported on Windows 11 when running compatible AMD processors on certain applications," AMD says. 

AMD says a fix is coming from Microsoft in the form of a Windows update scheduled for this month. 

"A Windows update is in development to address this issue with expected availability in October of 2021," AMD says. 

To help consumers navigate strict hardware requirements for Windows 11, Microsoft released an updated version of its PC Health Check app. Microsoft's page detailing its Windows 11 system requirements is available here

But around half of the business workstations won't be able to upgrade immediately because of these hardware requirements, according to one survey.  

AMD also notes that "measured and functional L3 cache latency may increase" by a factor of three.  

The chipmaker, which has about half of the desktop market, also lists its "preferred core" technology as an issue with Windows 11. The hardware interface "may not preferentially schedule threads on a processor's fastest core", AMD says. With some applications, this also affected performance and is more likely to impact enterprise organizations and gamers with high-end machines. 

See also: Microsoft's Windows 11: How to get it now (or later).

Performance issues will be more noticeable in machines with more than 8-core processors and over 65W Thermal Design Power (TDP), including many of its popular Ryzen processors

"AMD and Microsoft are actively investigating these known issues for resolution via software updates," AMD notes. 

Microsoft hasn't listed the AMD issues on its known issues page for Windows 11. The issues currently include compatibility problems between Windows 11 and Oracle's VirtualBox virtualization platform, Intel's networking software, and the Chromium-based Cốc Cốc browser for Vietnamese-speaking users.