First, the Windows 11 2022 Update was triggering BSOD (blue screens of death) on systems with intel SST drivers, then performance issues on NVIDIA graphics cards, and now it is performance issues on AMD Zen 4-based Ryzen 7000 series CPUs. Recently, CapFrameX (CFX) determined that when a single CCD (CPU Compute Die) is activated on the 16 core Ryzen 9 7950X, the configuration is able to overtake the default dual CCD 7950X. As each Zen 4 CCD features eight cores along with its cache, an octa-core Zen 4 CPU is essentially able to conquest the higher core count 16 core variant. In order to better understand the issue as well as the consequences of the problem, CFX decided to carry out two tests by disabling the simultaneous multi-threading (SMT). In the case where a single CCD was activated, the 16-core 32-thread 7950X was reduced to an 8-core CPU with 8 threads. Similar results were achieved in the SMT-off situation, just like the single CCD case, displaying better performance with fewer threads. Hardware Unboxed (HBU), an experienced hardware benchmarker, too observed a similar issue while doing the CPU testing with the RTX 4090 system. This means that it is not a one-off case as the issue is apparently happening very regularly off lately.
— Hardware Unboxed (@HardwareUnboxed) October 15, 2022 According to @OneRaichu, Windows 10, version 21H2 (also known as the Windows 10 November 2021 Update) seems to be more suitable for the AMD Ryzen 7000 series than the Windows 11 22H2 version. There could be several reasons behind the performance issue on the new Ryzen 7000 CPUs such as a possible scheduler issue on the graphics processor or a driver bug or it may be that the GPU driver itself is not properly exploiting the extra threads. Keep watching this space for more updates!
