Thursday, October 21st 2021
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Windows 11 Performance Issues on Ryzen Fixed by Updates from Microsoft and AMD
Microsoft and AMD on Thursday released software updates that fix the two performance issues affecting AMD Ryzen processors with Windows 11. The two issues were abnormally high L3 cache latency, and a broken "Preferred Cores" system. The companies had assessed that the issues impact performance of Ryzen processors on Windows 11 by as much as 15%.
The two issues are fixed in separate methods. The L3 cache latency bug is improved through a Windows Update patch, which has been released now as an Update Preview (an Update Preview is not a "beta," but a software update released ahead of its designated "patch Tuesday"). The Update Preview is chronicled under KB5006746, and Windows 11 systems updated with this, get their OS build version set as "build 22000.282." The next update restores the Preferred Cores mechanism that leverages UEFI-CPPC2. This update comes in the form of an AMD Chipset Software update. You'll need to download and install both of the following:
DOWNLOAD: Windows 11 October 21, 2021 Update Preview KB5006746 | AMD Chipset Driver Software 3.10.08.506
The two issues are fixed in separate methods. The L3 cache latency bug is improved through a Windows Update patch, which has been released now as an Update Preview (an Update Preview is not a "beta," but a software update released ahead of its designated "patch Tuesday"). The Update Preview is chronicled under KB5006746, and Windows 11 systems updated with this, get their OS build version set as "build 22000.282." The next update restores the Preferred Cores mechanism that leverages UEFI-CPPC2. This update comes in the form of an AMD Chipset Software update. You'll need to download and install both of the following:
DOWNLOAD: Windows 11 October 21, 2021 Update Preview KB5006746 | AMD Chipset Driver Software 3.10.08.506
85 Comments on Windows 11 Performance Issues on Ryzen Fixed by Updates from Microsoft and AMD
From 1TB/s on Win10 to around 400GB/s on Win11 even after the patch.
I find it ironic that the CPUs that Microsoft considers E-waste are the ones less affected.
32ns on your 5950X is way off. My 1700X L3 is 10.3ns at 3.9Ghz.
Notice the CPU I am actually using is the 1950X and 10.2ns is inline with Zen1 latency, but both results are still slightly slower than Win10.
Things are not *perfect* but they are massively better.
4900HS laptop with Win11. Updated windows, and driver too.
Something was obviously amiss, otherwise AMD didn't have to issue a new driver.
Raises the question of what kind of testing AMD (and Microsoft) did if they didn't notice that the preferred core detection wasn't working right. Makes you wonder what else they missed.
The Win10 result is from May and is using older BIOS and AGESA but I don't think that's related. BIOS settings are all the same and I don't have anything overclocked, well, apart from PBO and XMP being enabled
Win10 (May, Agesa 1.2.0.2)
Win11 (yesterday, Agesa 1.2.0.3b)