Final Fantasy XIV: A Realm Reborn is without a doubt one of the most beautiful MMORPG we've ever seen - so you may be interested to find out whether your current desktop is equipped to handle the game or not.
You can download the benchmark here.
You need at least 2000 points in order to run the game on the standard settings, but some powerful gaming configurations have been known to score more than three times that sum, and if that's the case with your computer it will hardly break a sweat running the game.