I7-4790k, 2080 super (had the same problem with my old GPU a gtx 970) , Z97X-Gaming 3, 16GB ddr 3 ram. I had it installed on a SSD and only had CSGO and windows installed on it, switched CSGO to my HDD but same problem still occured. Have resseted my bios, reinstalled windows several times and nothing have fixed it. And its only on CSGO all other games works perfectly fine