Document reveals the 16C/32T chip can consistently OC to 4.3GHz on all cores. Gigabyte's Aorus X570 overclocking guide PDF has been found to be an interesting source of pre-launch AMD Ryzen 9 3950X testing data. The linked document looks at the OC possibilities open to users of the Gigabyte X570 Aorus Master motherboard, with an AMD Ryzen 9 3950X processor installed, 16GB of DDR4 3200MHz RAM, and a liquid cooler with 360mm radiator.

In the document Gigabyte notes that the 3950X has a Max Boost frequency of 4.7GHz - but that figure applies to just two cores. It then walks users through pushing their mobo/CPU combo to achieve the highest stable speeds with all 16 cores processing. There are the usual warnings about warranties and overdoing voltage tweaking.

After various clock, voltage, and memory adjustments in the Aorus BIOS, in the dedicated 'Tweaker Tab', users are encouraged to go through stability checking and stress testing. Whether you achieve success or not you might want to revise the tweaks to be gentler or fiercer.