I played for about an hour with Afterburner and nothing is really bottlenecking. I'm still probably gonna look into getting more RAM but I'm attributing it to a game problem rather than a hardware problem.8 GB is pretty low. Do you have Afterburner to see what the bottleneck is? RAM is pretty "cheap" right now if you have two extra slots.
I noticed once I went exclusive fullscreen though I gained a couple more frames and it was hitting 60FPS a bit more consistently but not where I want it yet, in battle I'm still dropping down to the mid 40's. I'm gonna keep on playing and hope the patch they have on the actual launch date will fix up some of the performance issues I'm having.