3.7GHz i7
16 GB of DDR3 RAM
GeForce GTX 550 Ti 4000 MB
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3.7GHz i7
16 GB of DDR3 RAM
GeForce GTX 550 Ti 4000 MB
Download and run the benchmark test? http://na.finalfantasyxiv.com/benchmark/
Your system exceed the recommended system requirements, so I think you should able to use high graphics. Feel free to fiddle around with the fps and settings though if you notice any slow-down.
If you really don't want to experiment like that, use the benchmark and try to get at least a "high" performance rating with the settings you want.