https://www.pcgamer.com/new-amd-driver-fixes-overclocking-issues-on-radeon-rx-vega-cards/

AMD continues its blitz of GPU driver updates with yet another release, version 19.4.1 of its Radeon Software Adrenalin 2019 Edition. Compared to previous updates, though, this one is fairly minor—it fixes an overclocking issue within its WattMan utility and stomps out a few other bugs

Apparently some Radeon RX Vega graphics card owners have been running into issues with the auto overclocking control in Radeon WattMan. In some cases, the utility fails to raise the engine clocks past the default levels on Vega GPUs. This driver is supposed to fix that issue.