AMD has just uploaded a new version of their Radeon 18.9.3 drivers that are now WHQL signed. We confirmed with AMD that that's the only change, as the company promotes their beta drivers to WHQL from time to time, if no new issues arise.

Radeon Software Adrenalin 18.9.3 improves performance of Assassin's Creed Odyssey and Forza Horizon 4. It also fixes stutter on some FreeSync configurations and solves the reboot during driver install on 16-core CPU configurations during driver update.

Source: TechPowerUp