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Captain_Yuri said:

It’s official: AMD Ryzen 7 5800X3D does not support overclocking

https://videocardz.com/newz/its-official-amd-ryzen-7-5800x3d-does-not-support-overclocking

Looks like the rumours were indeed true which is kinda bad. We will see how it performs though.

It's a shame, but at least the reason they give for that limitation makes sense:

https://www.techpowerup.com/293001/amds-robert-hallock-confirms-lack-of-manual-cpu-overclocking-for-ryzen-7-5800x3d

It turns out that the 3D V-Cache is Voltage limited to a maximum of 1.3 to 1.35 Volts, which means that the regular boost Voltage of individual Ryzen CPU cores, which can hit 1.45 to 1.5 Volts, would be too high for the 3D V-Cache to handle. As such, AMD implemented the restrictions for this CPU. However, the Infinity Fabric and memory bus can still be manually overclocked. The lower Voltage boost also helps explain why the Ryzen 7 5800X3D has lower boost clocks, as it's possible that the higher Voltages are needed to hit the higher frequencies.