AMD Reports Windows 11 May Cause Up To 15% Performance Slow On Ryzen Processors
If you have an AMD Ryzen chip in your gaming rig, you may want to delay upgrading to Windows 11 for a moment. AMD and Microsoft have announced that AMD processors compatible with Windows 11 “may exhibit reduced performance in some applications when running Windows 11”, according to a blog post that our friends from Tom’s gear Point.
It means more than 100 AMD processors may be affected. According to AMD, one problem is that measured and functional L3 latency can almost triple, which reduces performance in some applications that rely on memory and cache latency, like gaming.
The other problem is that AMD’s “preferred kernel” feature does not work as advertised. Preferred kernel assigns applications to the fastest kernel on the chip. This too can cause noticeable performance drops with chips of 65W and above.
Below is AMD’s full review regarding these two known issues:
|Known performance changes||Impact|
|Measured and functional L3 cache latency can increase by approximately 3X||Applications sensitive to access time to the memory subsystem may be impacted. Expected impact on performance of 3 to 5% in affected applications, 10 to 15% possible outliers in games commonly used for eSports.|
|UEFI CPPC2 (“preferred core”) may not preferentially schedule threads on the fastest core of a processor||Applications sensitive to the performance of one or a few CPU threads may exhibit reduced performance|
AMD confirms that all Ryzen processors supported by Windows 11 are affected, as well as EPYC and Anthlon chips.
Our testing of a Ryzen 9 5900X on Windows 10 and 11 showed no appreciable difference in performance, but it’s one in over a hundred chips on the list. (Although we have found other issues that may affect gaming performance on Windows 11.)
At this time, nothing is reported about how Windows 11 affects Intel chips, although I’m sure if you’re Intel you’re not shedding any tears. for the competition.
AMD says a Windows and software update later this month should fix the issues. Windows 11 is currently available as a free upgrade for Windows 10 users. In view of all this, however, you might want to do what some of our readers are doing and wait for do the upgrade.