AMD: Windows 11 is up to 15 percent slower on AMD CPUs, fixes coming in October – Computer – News

AMD recognizes that Windows 11 runs slower on compatible AMD processors than Windows 10. This is due to issues in the L3 cache and the way the processor distributes threads across cores. Microsoft and AMD are working on updates to be released in October.

In the first issue, the latency of the L3 cache is three times higher than Windows 10. As a result, applications that are sensitive to memory subsystem acces time-differences work slower than before, writes AMD. Applications that are sensitive to this can run about three to five percent slower than they should. Some programs, “such as games commonly used for esports,” may run 10 to 15 percent slower than on the previous OS.

The second problem lies with CPPC2 within the UEFI, which determines which threads are processed by which cores. With Windows 11, threads would no longer be automatically processed by the fastest core of a processor. Especially programs that depend on one or few threads would see reduced performance. This problem would therefore be especially noticeable in processors with eight cores or more and a TDP above 65W.

The L3 cache requires a Windows update, the CPPC2 problem can be solved with an AMD update. AMD says both updates will be released in October. Until then, affected users are advised to stay on Windows 10.

Windows 11 appeared Monday night. Tweakers published on Tuesday benchmarks of the new operating system. This already showed that the AMD CPU used in certain applications worked slower than on Windows 10, although there were little to no differences in other applications.

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