After 3xCTD (Crash to Desktop) on Beez 67, Goodwood & Suzuka...there were to be found a solution.
At first I thought it was original fan on a 660 Ti...but it seems to be remnants from the old NVIDIA drivers who make trouble.
Download this small application, it removes all old & new. After uninstall, PC restarting...& you must install your NVIDIA drivers Again.
I would recommend you use the most recent driver you will find here after you have used the little clean-up program. NVIDIA
Notice: NVIDIA GeForce before 400 series does not support 347.09, but 340.52.