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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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Kaarme
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Senior Member
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#5952750 Posted on: 10/07/2021 09:33 AM
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.
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.
DarkQuark
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Joined: 2004-10-17
Senior Member
Posts: 107
Joined: 2004-10-17
#5952769 Posted on: 10/07/2021 09:59 AM
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.
I am running it just because my Win10 install crapped itself and I figured why not since it was in beta phase. I use a 5800x and while I am sure there is a slowdown it's not enough to functionally notice. At least I haven't.
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.
I am running it just because my Win10 install crapped itself and I figured why not since it was in beta phase. I use a 5800x and while I am sure there is a slowdown it's not enough to functionally notice. At least I haven't.
rl66
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Joined: 2007-05-31
Senior Member
Posts: 3135
Joined: 2007-05-31
#5952774 Posted on: 10/07/2021 10:01 AM
Wise words (whatever your favorite brand).
The patch is already on the way, and there is other "slow" things on Intel side too (with file browser as an exemple)...
Although that being said, nobody but those with a really pioneering spirit should be switching to Win11 at this point anyway.
Wise words (whatever your favorite brand).
The patch is already on the way, and there is other "slow" things on Intel side too (with file browser as an exemple)...
Andy Watson
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Posts: 264
Joined: 2017-09-22
Senior Member
Posts: 264
Joined: 2017-09-22
#5952775 Posted on: 10/07/2021 10:03 AM
You would have to be mad to switch to Windows 11 so quickly when Windows 10 is one of the better MS releases like Windows 7, XP , Dos 6.22 etc and not Vista or Windows ME.
You would have to be mad to switch to Windows 11 so quickly when Windows 10 is one of the better MS releases like Windows 7, XP , Dos 6.22 etc and not Vista or Windows ME.
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The real issue is the L3 cache thing. CPPC is not a dealbreaker until it is fixed, even less so on CPUs overclocked via curve optimizer (where cores' max clocks are more evened out between each other).