I'm also on a GTX970. I still use the 344.xx drivers. The only issue I've encountered is FFXIV failing to close. Outside of that, the driver has not crashed FFXIV like you're experiencing. You could try http://www.extreme.outervision.com/p...ulatorlite.jsp to see if you have an adequate power supply. If you are having RAM voltage anomalies then try resetting the BIOS settings to fail-safe defaults.