Good morning and thank you for posting on the Final Fantasy XIV Technical Support Forums.

Since the GPU fans start running at max speed, it does sound like a GPU-related error. Have you tried doing a clean reinstall of the graphics drivers?

I'd also recommend trying a clean boot. Simply open the task manager and select the 'Start up' tab. Disable everything here and restart the PC. This will make sure that no background processes are interfering with the game.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!