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JEMC said:

So, it looks like MSoft (and maybe AMD) didin't learn from the last time and it has happened again, right?

Windows 11 appears to be hobbling AMD Ryzen 7000 performance
https://www.pcgamer.com/windows-11-amd-performance-ccd/
The performance of AMD's latest CPUs appears to show that it's the Ryzen 5 CPUs that are the best option for gamers. This is because the double CCD (Core Compute Die) configurations to be found at the top of the Ryzen 7000 stack seem to be falling foul of the Microsoft Windows 11 thread scheduler and performing worse than they should.

CapFrameX (opens in new tab) and Hardware Unboxed (opens in new tab) both took to Twitter to reveal that AMD's top chip of this generation was lagging behind the single CCD chips in some games—with Metro Exodus in particular dropping from 176fps on average from a single CCD down to 151fps at the stock Ryzen 9 7950X configuration.

Turning off the second CCD can unlock the performance of the chip, but halving the core count isn't exactly something you'd want to do after splashing out $699 on the AMD Ryzen 9 7950X (opens in new tab). Alternatively, you could just pick up a chip that has a single CCD by default, such as the Ryzen 5 7600X or the Ryzen 7 7700X. 

CapFrameX also tested to see if performance also improved after turning off SMT (Simultaneous MultiThreading) and sure enough, it did. But, and it's an important point here, the single CCD version of the chip with SMT off performed even better—it managed 190fps, with the minimums also improving significantly compared to the default configuration.

This is why the finger of fault ends up pointing at Microsoft's Thread Scheduler once again—there was a similar problem on this front last year with the release of Windows 21H2, which saw performance drop significantly for AMD's chips. A chipset driver update (opens in new tab) was needed back then to sort out the performance. 

How come these big companies can make the same mistake multiple times? You'd think that they had learned and, once fixed, it was really fixed.

It's because they are so big. Too big to not fail...