Is anyone else getting a problem where the screen goes black and an error pops up saying "Display driver stopped responding and has recovered"? This happens roughly every 10-15 minutes of play and its annoying the hell out of me. FF14 is the only game that does this to me, so its not my hardware.
Your video card is overheating, then shutting down so it doesn't melt, then overheating, then shutting down, etc... etc...
Go to your catalyst or nvidia control center and turn off automatic fan speed, then turn your fan speed up to around 65-75%, more if that doesn't fix it. It's going to be loud though.
Automatic mode for both nvidia and ati caps the fan at 40%, so as to maintain low noise. Sounds like this game is taxing your card pretty heavily.
I can't wait for dx11 support when ps4 comes around, then it'll be taxing my card as well and it should look even more stunning.