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AMD Ryzen CPUs take performance hit in Windows 11 OS

by on07 October 2021

L3 cache latency to blame

While a bunch of AMD CPUs are officially compatible with Windows 11 OS, this does not mean all is well with the new OS, as AMD and Microsoft have made a discovery that shows an indecent impact on application performance due to higher L3 cache latency.

According to details provided by AMD, there are two issues with AMD CPUs and Windows 11 OS, including an around 3x increase in L3 cache latency and UEFI CPPC2 "preferred core" which has problems in scheduling threads on the CPU fastest core.

In terms of a performance hit, the increase in latency affects applications sensitive to memory subsystem access time with the performance hit of around 3 to 5 percent in applications and 10 to 15 percent in eSports games.

The preferred core issue can be noticed in applications sensitive to the performance of one or a few CPU threads and is more detectable in CPUs with more than eight cores and 65W+ TDP. Basically, the OS can't properly pick the best cores in light-threaded applications, resulting in reduced performance.

Thankfully, these matters were spotted early and can be resolved with a simple software update and, according to AMD, will be coming with a Windows Update this month.

You can check out full details over at AMD's website


Last modified on 08 October 2021
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