I have an identical system, I experienced what you described on one game COD WW2. Everytime the GPU VRAM would reach max for example 8gb. The display would micro stutter, took me a while but I found a fix you can try. Unfortunately it resets everytime you restart. In GEFORCE EXPERIENCE main game menu, click DETAILS whichever game you're going to play. Then hit wrench on right of screen. Then slide marker towards the performance side and not quality. Hit apply then play game through geforce. Has worked for me not just on that system but multiple systems with that damn game