According to an AMD knowledgebase article that was updated late yesterday, Microsoft and AMD have both published patches to fix AMD Ryzen performance flaws that were found in the original versions of Windows 11.
For Ryzen processors with high core counts and high TDP, AMD has released a new chipset driver that fixes a bug that prevented the “preferred core” feature from working properly. No matter what Windows version or Ryzen CPU you have, the new driver resolves a handful of other Ryzen and Threadripper PCs running either Windows 10 or Windows 11, regardless of whether you are affected by the specific bug.
All Ryzen CPUs were afflicted by a problem that reduced performance by 3 to 5 percent for most apps and by up to 15 percent for certain games. Microsoft began rolling out a patch for the L3 cache issue to testers last week, and it is one of several bugs addressed in Windows 11 build 22000.282. (Run “winver” command into Run Window and find your windows build version)
Windows 11 Home and Pro customers will have the fix available as an optional update via Windows Update if it hasn’t already been installed. If this is the case, the update will be included in the upcoming Patch Tuesday package.