The first thing you most look at when upgrading the GPU is whether your PSU is strong enough to support it.
According to AMD you must have at least a minimum PSU of 500 Watts. I suggest a PSU of at least 850 Watts Metal rated PSU if within your budget.
As for bottlenecking go to this website I use to get a GENERAL idea if your CPU, RAM, & GPU will bottleneck at various Resolutions and playing various modern games: FPS & Bottleneck Calculator