After the official release of Windows 11 on 5th October 2021, AMD users reported about a 15% of performance drop after the upgrade. Most of the AMD users’ PCs were fully compatible with Windows 11 and had no such issue prior to Windows 10.
AMD and Microsoft immediately addressed the performance drop issue for some applications running on Windows 11 with AMD CPUs. The two major causes behind the issue were L3 cache latency and UEFI CPPC2 not using the fastest core.
The L3 cache is a specialized memory that serves backup and boosts the L1 and L2 cache performances. Already it’s not fast compared to the primary caches memory but the further latency into L3 will definitely impact some applications around a 5% drop.
Majorly huge online and eSports games such PUBG, COD, GTA-V, Final Fantasy, and more were hit by an almost 15% drop to the AMD Ryzen CPUs.
The next preferred UEFI CPPC2 core was not passing threads to the AMD’s fastest core which will obviously slow down Windows 11 by the ratio of the ones to the total number of cores. That could reach to 15-20% drop for the overall system.
AMD released a new chipset driver to fix Windows 11
AMD has come up with a new chipset driver update for Windows 11 to fix the UEFI CPPC2 scheduling. The UEFI CPPC2 bug used to miss the best AMD CPU core to assign their tasks. A new driver update has resolved this issue on the affected Ryzen CPUs.
The Ryzen CPUs with more than 8 cores and 65 watts TDP, used to affect the Applications dependent on multiple CPU threads. Well, AMD’s latest 3.10.08.506 chipset driver will resolve the bugs with UEFI CPPC2 on the latest Windows 11 builds.
Microsoft has also verified the Windows 11 fix by AMD and has recommended users to update to the latest chipset drivers. You can manually download, verify, and install AMD Ryzen Chipset Driver 3.10.08.506 on your PC. Alternatively, AMD Auto-Detect Tool will automatically verify, download, and then install the latest compatible chipset driver update on your PC.
Windows 11 KB5006746 fixed the L3 cache latency
Microsoft released the next stable Windows 11 KB5006746 update with lots of improvements and fixes. It has also addressed one major issue with the L3 cache on AMD Ryzen devices that was affecting some applications’ performance.
Windows 11 KB5006746 is an optional update for stable users. Go to Windows Update to find the latest 2021-10 Cumulative Update of Windows 11 for x64-based Systems (KB5006746). Then tap on the download and install button to begin the installation. It’s also discretely available on the Windows Update Catalog website for x64 and ARM64-based devices.