Square Enix have released the official benchmark program for Final Fantasy XIV. The application allows you to see how well your machine is capable of running the game. Upon running the benchmark you will be asked to select a race and a screen resolution. After this you can start the test and a cutscene will be played.

Upon finishing the cutscene you will be presented with a score based on how well your machine performs. The scores will determine whether your machine should be able to run the game, but this does not guarantee it as it may depend on which software you have installed. The chart below shows the different results:

[8000 and over] Extremely High Performance
Easily capable of running the game on the highest settings.
[5500–7999] Very High Performance
Easily capable of running the game. Should perform exceptionally well, even at higher resolutions.
[4500-5499] High Performance
Easily capable of running the game. Should perform well, even at higher resolutions.
[3000-4499] Fairly High Performance
Capable of running the game on default settings. Consider switching to a higher resolution depending on performance.
[2500-2999] Standard Performance
Capable of running the game on default settings.
[2000-2499] Slightly Low Performance
Capable of running the game, but may experience some slowdown. Adjust settings to improve performance.
[1500-1999] Low Performance
Capable of running the game, but will experience considerable slowdown. Adjusting settings is unlikely to improve performance.
[Under 1500] Insufficient Performance
Does not meet specifications for running the game.

Check the link below to download the benchmark.

Source: Official FFXIV Website