While AMD claim it can be overclocked to 4200 or 5133, it doesn't invalidate my claim that officially it is spec'd for DDR4-3200 according to the product page: https://www.amd.com/en/products/cpu/amd-ryzen-9-3950x
Note I am not playing down the 3950X's performance. It is overall a processor superior to Intel's counterparts in most aspects.
Every ddr4 module beyond that is officially a 3200 module with overclock option.
That's why you need to enable Extreme Memory Profile in your bios to use speeds beyond 3200.
Note I am not playing down the 3950X's performance. It is overall a processor superior to Intel's counterparts in most aspects.