As with previous Windows updates, the Windows 11 2022 Update (also called “22H2”) released last month is too plagued with several serious issues ever since its release.
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.
Something interesting I've noticed as I updated all our CPU data with the RTX 4090 is 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 for example, where as now it does.
— Hardware Unboxed (@HardwareUnboxed) October 15, 2022
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!