I have an R9 280 and I want to upgrade to an RX 580 soon. I wanted to know if I need to uninstall the current driver (I have the latest version of the Radeon Software Utility) or I just can install the new GPU right away since it's an AMD GPU and it's using the same Radeon Software ?
First download and save the drivers for your new card.
With the old graphics card installed, delete the drivers using the control panel uninstall:
REBOOT IN TO 'SAFE MODE' and run DDU Display Driver Uninstaller Download version 184.108.40.206
Choose 'clean and shut down'.
Remove the old graphics card and install the new one.
Boot and install the correct driver for your new card.