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Windows 11 Performance degradation with AMD Ryzen processors

If you use a gaming PC with a Ryzen CPU from AMD and want maximum fps, you should wait for the upgrade to Windows 11.

AMD’s Ryzen processors for notebooks and desktop PCs currently run slower with Windows 11 than with Windows 10. The company has confirmed two errors, the level 3 cache of all processors supported by Windows 11 from Zen 1 to Zen 3, as well as the Thread distribution concern. In games, frame rates can drop by up to 15 percent. In applications, there is talk of a moderate 3 to 5 percent drop in performance.

Specifically, according to the AMD article, the L3 cache works with around three times the latency under Windows 11. Since games are latency-critical, the performance drops particularly sharply there. It is possible that computing cores simply access the L3 cache of other core complexes (CCX) – in this case, we measured almost tripled latencies in the test.

In addition, the communication between the processor and the thread scheduler via the Windows 11 API Collaborative Power and Performance Control 2 (CPPC2) no longer works correctly. Ryzen processors use this API to report their fastest processing cores to the operating system so that applications that only use a few threads run on them.

Because this does not work under Windows 11, according to AMD, 12 and 16 core devices for desktop PCs in particular, such as the Ryzen 9 5900X, suffer. Such models have two CPU chips, one of which usually reaches higher clock frequencies than the other with differences of several hundred MHz.

AMD is working with Microsoft on Windows and other software updates that fix both problems and should be released in October 2022. Until then, AMD recommends not to upgrade to Windows 11 yet.

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