The next version of Windows 11 version 22H2 appears to be causing a strain on the Zen 4-based Ryzen 7000 series CPUs. CapFrameX (CFX) has discovered that when a single CPU (CPU Compute Die) on the 16 core Ryzen 9 7950X is active, the configuration is able to outperform the default dual CCD 7950X. Hence, an octa-core Zen 4 CPU is able to defeat the higher core count 16 core variant
To better understand the issue and examine the implications of the problem, CFX decided to perform two additional experiments where simultaneous multi-threading (SMT) was disabled. In a single CCD situation, the 16 core 32 thread 7950X was now reduced to an eight core CPU with eight threads.
Similar results were shown in the SMT-off situation, which fits perfectly in the single CCD case.
This does not seem like a one-off incident, either as a former hardware benchmarker Hardware Unboxed (HBU) discovered a similar issue on their RTX 4090 test system. It has apparently been happening much more frequently in recent times.
As I updated all of our CPU data with the RTX 4090, I''ve noticed that there are now many instances where single CCD Ryzen CPUs are faster (better for driving high fps) Previously the R5 3600X never really beat the R9 3950X, where as it does.
The performance flaw on Windows 11 22H2 (via @OneRaichu) appears to be a concern for Windows 11 22H2''s new Ryzen 7000 processors, which is why more threads aren''t working. There might be a driver flaw in play here, similar to the Nvidia fiasco that occurred recently. Perhaps the GPU driver itself is not properly utilizing the extra threads.