I have a similar CPU and I have the same card as you, a GTX 970 with 4 gb VRAM. I have the same issue as you but I get Display Driver errors, Kernal Errors, and TDR's errors even though I changed it in the registry folder. If you are running Windows 7, I believe 347.88 fixes the issue. I got 10, so I stuck with the error even though I've tried all the drivers. You also could go into Nvidia control panel and change power management mode to Maximum Performance Mode. I believe this is a Nvidia problem-all their drivers are broken in some way.
Let me know if this solves your issue