Microsoft has officially fixed an L3 cache performance bug that
has been vexing AMD Ryzen owners since the release of the new
The Windows 11 Update released today, KB5006746, Addresses an L3 caching issue that
might affect performance in some applications on devices that have
AMD Ryzen processors after upgrading to Windows 11 (original
The Ryzen fix is among other improvements and fixes to the new
OS, but Ryzen owners are likely hot to mash the Windows Update
button in Windows 11. The L3 bug has been said to increase Ryzen's
latency by as much as 3x but that may have been kind. Testing by
Paul Alcorn of Tom's Hardware found Windows 10 had 12x the bandwith
with a Ryzen versus Windows 11.
A CPU's L3 cache is a small bit of memory inside the CPU that
helps keep instructions and data closer at hand and improves
performance and responsiveness so the problem was seen as a major
Combined with the earlier chipset update from AMD that corrected
a problem with Windows 11 recognizing the CPU's best cores, Windows
11's performance issues on Ryzen should no longer be an issue.
To get the update, simply press the Windows key, and type
Windows Update. Then click the Check for
updates button to see if it's offered. The Windows version
should show OS build 22000.282.