I find that interesting due to the fact that its a fresh install of windows pro.
I just picked myself up an i7 7700K, 16GB of Vengence RAM and a 512GB 970 Evo Pro, which I paired with my Z270 Gaming Mobo. Im using a R9 390x GPU.
I did all the main essentials, Windows Update, Java, Falsh Player, CPUID, Afterburn, HWM, GPU Driver (AMD) and a new one, Samsung Magician for the 970.
I haven't touched a driver for any other GPU on this build. The R9 390x was the first GPU in the PC after the initial install.
I do seem to be having some issues with the AMD driver as well, maybe this is the same problem. I try and open the AMD panel and it jst shuts down. In game my FPS is dipping and spiking like crazy.