announced AMD says that all of its Windows 11-compatible processors can suffer performance drops in some applications when used with the new operating system, with extreme values in gaming titles leading to a reduction of between 10 and 15 percent.
For applications, AMD says the performance impact is between 3 and 5 percent. A software update and a Windows update are in the works to address the issues, and both are expected to arrive in October 2021.
The bugs affect every Ryzen processor supported in Windows 11. This means all Zen+, Zen 2, and Zen 3 processors made up of Ryzen 2000, Ryzen 3000, Ryzen 4000, and Ryzen 5000 processors.
In addition, select AMD EPYC processors for data centers are also affected, along with some of the newer Athlon chips. And you can examining on the full list.
The AMD advisory says the problem falls into two categories. First, measured and functional L3 latency can increase approximately 3x, which means that you can see the effect with benchmarking tools and that it results in real performance degradation in games and applications.
The bug affects applications that are sensitive to the memory subsystem’s response time, causing a performance drop of between 3 and 5 percent.
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Windows 11 causes problems for some AMD Ryzen processors
This issue also causes a 10 to 15 percent performance drop in games commonly used in esports, because games tend to be very memory and cache sensitive.
Additionally, AMD’s “preferred core” feature, which directs single-threaded applications to the two fastest cores across the chip, may not work as expected.
This mainly affects performance in lighter threaded applications. AMD says this performance drop may be more pronounced on chips that have eight or more cores and a TDP rating of 65W or higher.
AMD and Microsoft are looking into these known issues to resolve via software updates, and AMD updates its advice when available.
AMD also advises that its customers who are experiencing problems continue to use a supported version of Windows 10. This means that it may not be a good idea to upgrade to Windows 11 until the problems are corrected.
Notably, this issue appears to be separate from the performance issues surrounding Microsoft’s recommended VBS and HVCI security settings.
AMD says it expects to update Windows to resolve L3 cache issues. Whereas, a software update addresses the issue using the preferred kernel technology UEFI CPPC2. Both are expected to arrive this month.
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