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Windows 11 is up to 15 percent slower with AMD CPUs, fixes coming in October
AMD acknowledges that Windows 11 is slower than Windows 10 on suitable AMD processors. This is due to issues with the L3 cache and the processor's thread distribution across cores. Microsoft and AMD are now working on fixes that will be available in October.
The L3 cache's latency is three times that of Windows 10. As a result, AMD cautions that applications that are sensitive to memory subsystem access time variances may operate slower than before. Sensitive applications may operate around three to five percent slower than they should. Certain programs, "such as those frequently used in esports," may perform 10 to 15% slower than they did on the previous OS.
The second issue is with CPPC2, which controls which threads are processed by which cores within the UEFI. With Windows 11, threads would no longer be processed automatically by the processor's fastest core. Performance degradation would be noticeable in particular for programs that rely on a single or a few threads. This issue would be most obvious in processors with eight or more cores and a TDP more than 65W.
While Windows updates are required for the L3 cache, AMD updates can resolve the CPPC2 issue. AMD has stated that both patches would be available in October. Affected users are recommended to continue using Windows 10 until then.
Windows 11 was released on Monday evening. On Tuesday, tweakers provided benchmarks for the new operating system. This already shown that the AMD CPU utilized in certain apps performed slower than the CPU used in Windows 10, although the differences were minimal in other applications.
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Timur Born
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Posts: 57
Joined: 2020-01-24
Member
Posts: 57
Joined: 2020-01-24
#5952798 Posted on: 10/07/2021 10:49 AM
The L3 cache issues were known for months already, so someone (MS or AMD) is quite late to the launch party.
The L3 cache issues were known for months already, so someone (MS or AMD) is quite late to the launch party.
rl66
Senior Member
Posts: 3141
Joined: 2007-05-31
Senior Member
Posts: 3141
Joined: 2007-05-31
#5952801 Posted on: 10/07/2021 11:00 AM
I have been using it for 2 or 3 weeks at this point. I had one crash and no other problems I can detect. For a beta it's damned stable.
I am unhappy with the HDR stuff though. It was supposed to handle HDR better and there are more settings but it still seems super wonky, HDR wise. Minor stuff but it's one of the reasons I swapped.
I am happy with it too, specialy from the linux stuff that are really great.
I never crashed too despite on dev chanel, it is more stable than W10 so far...
BUT there is still things to fix that would be real big drama for lambda user without knowledge (mean "most user").
Being early user is more for us, and expose you to those problem.
I have been using it for 2 or 3 weeks at this point. I had one crash and no other problems I can detect. For a beta it's damned stable.
I am unhappy with the HDR stuff though. It was supposed to handle HDR better and there are more settings but it still seems super wonky, HDR wise. Minor stuff but it's one of the reasons I swapped.
I am happy with it too, specialy from the linux stuff that are really great.
I never crashed too despite on dev chanel, it is more stable than W10 so far...
BUT there is still things to fix that would be real big drama for lambda user without knowledge (mean "most user").
Being early user is more for us, and expose you to those problem.
PrMinisterGR
Senior Member
Posts: 7896
Joined: 2014-09-27
Senior Member
Posts: 7896
Joined: 2014-09-27
#5952802 Posted on: 10/07/2021 11:00 AM
Because Intel can bribe Microsoft into sabotaging their own OS they want to release, that is already controversial.
Maybe a bag of money of considerable size was exchanged to keep AMD out of the loop. Let's all remember that with Intel, anything goes 
Because Intel can bribe Microsoft into sabotaging their own OS they want to release, that is already controversial.
mackintosh
Senior Member
Posts: 604
Joined: 2012-11-28
Senior Member
Posts: 604
Joined: 2012-11-28
#5952803 Posted on: 10/07/2021 11:02 AM
Even with this apparent homogeneity, iOS is a bloated mess. 15 has been the most bug riddled morass I have ever had the displeasure of using, matching iOS 7 as possibly the worst iOS release in history. There isn't an Apple device in my stable that isn't having issues, and I own iOS devices both old and brand new.
As for Windows, it's always come with teething problems on release. This doesn't surprise me; Microsoft is more likely to make sure Intel CPUs work before they will tackle AMD compatibility. It's a simple matter of market share. No one is going to go out of their way to cripple their own OS to help someone else out. Not at this level. It's also one of the reasons some users continue to prefer Intel over AMD, even if AMD may sometimes offer better performance.
That actually makes sense. Apple hardware is homogenous and proprietary. Windows has to run on anything "compatible" out there.
Even with this apparent homogeneity, iOS is a bloated mess. 15 has been the most bug riddled morass I have ever had the displeasure of using, matching iOS 7 as possibly the worst iOS release in history. There isn't an Apple device in my stable that isn't having issues, and I own iOS devices both old and brand new.
As for Windows, it's always come with teething problems on release. This doesn't surprise me; Microsoft is more likely to make sure Intel CPUs work before they will tackle AMD compatibility. It's a simple matter of market share. No one is going to go out of their way to cripple their own OS to help someone else out. Not at this level. It's also one of the reasons some users continue to prefer Intel over AMD, even if AMD may sometimes offer better performance.
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Senior Member
Posts: 7831
Joined: 2009-11-13
Did Microsoft concentrate on the development work with Intel, due to the major BIG+little architecture change, and AMD was left out of the meetings? The hour seems pretty late for fixing serious problems with Ryzen CPUs only now.
Although that being said, nobody but those with a really pioneering spirit should be switching to Win11 at this point anyway.
Maybe a bag of money of considerable size was exchanged to keep AMD out of the loop. Let's all remember that with Intel, anything goes