The driver update seems to have solved or at least reduced the problem (I only played a few minutes).

I'll keep in mind the clock timings matter. My card is a EVGA 960 SC that's slightly overclocked by default, yes.

Official timings
"Normal" 960 : 1127 MHz
EVGA 960 SC : 1216

My timings
NVidia panel : 1215
Inspector : 1216

Thank you Saccharin & Raist ^_^