AMD Ryzen and Epyc processors have performance issues on Windows 11

Since the release of Windows 11, PC users with AMD CPUs have noted performance degradation, and now AMD has confirmed that this is not something far-fetched: indeed, computers with Ryzen and Epyc CPUs do not run as fast as in Windows 10. And there are two reasons for this. ...

The first is related to the L3 cache - access delays to it in Windows 11 can increase three times compared to PCs running Windows 10. As a result, the speed of applications that are sensitive to the time of access to the memory subsystem is reduced by 3 -5%. But in games, performance can drop by up to 15%.

Another issue is that Windows 11 does not allow the fastest processor core to be allocated to a task or thread. AMD states that "applications that are sensitive to the performance of one or more threads may experience performance degradation" and that users will notice this phenomenon primarily on processors with a TDP of 65W (or greater) and 8 physical cores (or greater).

And although this state of affairs may upset many users, AMD promises to fix both bugs this month. The first will be fixed by updating Windows itself, the second - through proprietary software. Reportedly, the issues concern all Windows 11 supported AMD processors, that is, we are talking about CPUs on the Zen +, Zen 2 and Zen 3 architectures of the Ryzen, Ryzen Threadripper, and Epyc lines.

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