https://www.pcgamer.com/amds-releases-a-new-gpu-driver-to-boost-performance-in-fortnite-season-7/

Typically when a GPU driver release follows a new product launch, it adds support for that product. That isn't the case with AMD's Radeon Software Adrenalin 2019 Edition 19.1.1, though. There's no mention in the release notes of it supporting AMD's new Radeon VII graphics card, and instead it focuses on improving performance in Fortnite.

Specifically, AMD claims its newest driver is optimized to deliver up to 4 percent faster performance in Fortnite Season 7 on Radeon RX 580 graphics cards, while Radeon RX Vega 64 owners can expect up to a 3 percent faster performance, both when playing at 1920x1080.