Windows 11 is causing the issue in AMD Ryzen 9 5900X: AIDA64 

Microsoft recently released the first “Tuesday Update Patch” for the official version of Windows 11. The new version is Build 22000.258. The test found that the update makes the Ryzen CPU level three (L3) cache latency is worse than before.

Moreover, the tests using the AIDA64 memory benchmark show that the AMD Ryzen 7 2700X’s latency is now almost doubled (31.9ns) compared to the first version (17.1ns), which is comparable to the typical ~10ns measurement latency in the Windows 10 environment In comparison, the delay is more than three times.

However, AMD Ryzen 7 2700X is based on the earlier Zen+ architecture. Although the chip is officially supported by Microsoft for Windows 11 systems, you may naturally wonder what adverse effects Windows 11 will have on newer CPUs like Zen 3 architecture.

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Furthermore, Zen 3 CPU has some improvements under the cover compared to Zen +. One of the main shortcomings of the early Zen and Zen + designs was poor cache performance. AMD has made significant improvements to the later Zen 2 and Zen 3 architectures in this area.

But the odd thing is that for some reason, the L3 cache performance of the Zen 3-based AMD Ryzen 9 5900X was found to be no better than the previously tested Ryzen 7 2700X. AIDA64 also noticed that the L3 bandwidth has also suffered a significant performance loss on Windows 11.

Fortunately, there are reports that Microsoft will launch a Windows 11 update on October 19, which will fix this L3 cache delay. The same report also added that the CPPC2 issue will also be resolved with another update, which will be launched in a few days on October 21.

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