MMO's in general are CPU intensive. You have a mid range cpu with a mid range GPU so your bottleneck could be with both. If you lower your graphic settings and do not see a jump in FPS then most likely the bottleneck is with your CPU or if you do see a big jump in FPS than GPU would be where the bottleneck is. I run everything on MAX myself (60fps capped) with a nvidia 6870 GPU which isn't near a top of the line card but i do have an I7 4770k CPU 3.5 oc'd to 4.2.