I recently replaced my GTX 750 Ti with the R9 390X, I of course naturally expected a vast improvement but I received the exact opposite. When I attempted to run a few games (I'll use 1 as an example) on World of Warcraft my GTX 750 Ti was able to run that above 100fps at all times no problem, When I had installed the R9 390X and its drivers, it performs under 60fps with the same graphics settings with frequent drops to under 30fps.
I have tried all sorts of ways to remove old drivers and install new ones for the past day and especially the past few hours and none of that has worked for me. The temperature on the card has been fine, my power supply is a 1000w and I have 16GB of DDR3 2400mhz RAM. My processor is a 3.8ghz quad core as well as my motherboard is on the list which is compatible for the R9 390X graphics card. I don't know what else I can do so any help or any subtle trick that may fix this would be appreciated. Thanks.