This is incorrect, to the best of my knowledge. 3900X and 3950X both have a 142W package power limit (PPT, 35% above TDP) at stock, with a properly working motherboard. As I understand it, not even short boosts are allowed to use more power than the PPT.
The limit can be lifted in the BIOS (or e.g. Ryzen Master) but that would no longer be stock operation. And there was a defect in the initial BIOS of ASRock X570 and maybe other motherboards, which broke PPT but that was running the CPU out of spec, not stock operation.
The limit can be lifted in the BIOS (or e.g. Ryzen Master) but that would no longer be stock operation. And there was a defect in the initial BIOS of ASRock X570 and maybe other motherboards, which broke PPT but that was running the CPU out of spec, not stock operation.