Windows 11: latest update worsens performance of AMD processors, patch arrives October 19

Microsoft has just published the first Tuesday patch for Windows 11. However, the update is far from resolving the problem of reduced performance of AMD processors, quite the contrary. Indeed, it only worsens the situation. AMD announced the arrival of a patch on October 19.

As you may know, Windows 11 has just received its very first update , better known as Patch Tuesday. If the update in question corrected no less than 36 security flaws, owners of AMD processors expected it especially at the turn for a completely different reason.

Indeed, the final version of Windows 11 deployed since October 5, 2021 is encountering several problems with AMD SoCs . First, the OS can triple the rate of the L3 cache. This can cause CPU performance drops of around 3 to 5% on many applications, while this loss rises between 10 and 15% on some games such as Dota 2 or Counter-Strike: Global Offensive.

In addition, a bug in the UEFI-CPPC2 functionality prevents the movement of threads to the highest performing core. In fact, the first Windows 11 update was eagerly awaited to correct these concerns. Only, and as we learned from our colleagues at the TechPowerUp site, the latency of the L3 cache has further increased with the deployment of the new patch.

Credit: TechPowerup

AMD PROCESSOR PERFORMANCE CONTINUES TO DIP ON WINDOWS 11

Located at 10ns on Windows 10, the L3 cache latency had already risen to 17ns on Windows 11 . And with the installed KB5006674 update, the latency increased to 31 ns on an AMD processor Ryzen 7 2700X to eight cores! That is almost double. AMD confirmed the thing on social media and just announced the deployment of two patches between October 19 and 21, 2021 that are supposed to fix these performance issues.

It will be directly distributed via Windows Update, in other words no need for a specific utility. “ The issue of CPPC2 has been resolved. A new AMD power plan is in development and is expected to be released on October 21 […] The L3 cache latency issue has been addressed by Microsoft. Microsoft plans to publish the patch in its Windows Update 10C, scheduled for October 19, ” says AMD.