I've had my display driver crash twice since Early Access started, having never once had a single issue before the DX11 client came into the equation. The first time I was finishing my first Astrologian quest and the driver crashed when the cutscene ended, causing the client to error out and I had to relog.

The second time was about an hour ago as of the time of this post. I was standing at the Maelstrom HQ looking at expert delivery items and the screen went black, and my computer hard locked and shut down. It's a well ventilated and cooled PC, and I've had my card (gtx 970, same as OP and Samias) for a while with absolutely 0 problems. These issues only began yesterday with the Early Access client.

Hopefully either Square-Enix or Nvidia can sort it out.