I get 100% cpu usage and fps drops from 144 down to 60-80 playing Modern Warfare, but have had the same issues on other games, just not as bad. I have i7-7700K OC'ed at 4.8Ghz and a 1080ti. GPU isnt struggling at all. I have tried without OC, dosent change anything and ive checked for any other programs using cpu, i dont know what more to do.