your computer can run it, however, all mmos are cpu dependant far more then gpu, though this game does make good use of the gpu, and will be more so once they bring out the DX 11 drivers.

if you stand alone in the field somewhere, you are bound to get decent frames, however, add people around you doing something like hitting a boss, my advice is, go intel, AMD cpus arent bad, intel cpus are just that good, ive got a i5 3750k thats clocked to 4.4 ghz, 8 GB ram, and a 7970 GHZ card, my settings are on max, though ive toned down shadows as this actually a cpu intensive feature, this is true for other games as well. and while i do sustain 60 fps in the world mainly on my own, in groups like some fates, it can drop to 45 fps, but in a closed raid environment, im sure it will yield better frames though im unsure how the battle log behaves.

a gpu will add some performance, but a intel cpu will do more, however, changing out a motherboard and cpu out isnt cheap, at least £200- £250