Game makes my pc crash or restart.

Windows 7 64 bit.
12gb ram
nvidia geforce 670 GTX

I play for for awhile then my pc goes black crashes or instantly restarts.
If i try restart and play again it happens soon again.

Reinstalled already.

Did you recently install new drivers? I know the 400 and 500 series newest drivers have a bug that causes your pc to crash after a few minutes. It can be fine one minute then crash 10x in a row. Is it just FFXIV or will running another game cause the same issue you are getting?

Edit: Yes I know you are running a 670, just bringing up a point that might be the cause :-)

nope drivers are old.

Did you overclock any hardware from your computer? If yes, possibly your overclock-settings isn't right. try tweaking again. Wrong oc'ing will make your computer restarts, blue screen, crash on high-end games.