I have a R9 390X. After updating to the latest drivers (15.30.1025.1001-151204a-296876C) I've been having terrible performance. In Battlefield 4 and SW Battlefront I've been from being at 60 fps to 25-35. I'm not entirely sure if everything has been completely installed, the AMD installer is broken and always gets stuck. I can only assume that things are installed because Radeon settings runs and it tells me drivers are installed.