My game was crashing non stop even with stock defaults. my mother board had been sketchy for years. it would not sleep properly, USB was flakey, etc.. I would get signal lost all the time in various games. it started happening so frequently it became intolerable. this was a Z170 Asus board with i6700k. I decided to replace the board and got a Gigabyte Z270. The sleep and USB problems went away and crashes seemed less frequent but then signal lost started again. I decided to replace my 980Ti with a 1080Ti and things worked really well with multiple 5-8 hour marathons etc.. however a few days later I started to get hard crashes where the PC would shut off entirely. This happened 2x in a row yesterday. I am running a 650w Corsair PSU. Maybe I don't have enough power for the 1080Ti and I fixed one problem only to introduce another with higher powered components?